Fix output name of qpg_executable OTA

[mspang]

Problem

This always builds because it uses the wrong filename:

ninja: Entering directory `out/debug'
ninja explain: output build.ninja older than most recent input ../../third_party/connectedhomeip/third_party/qpg_sdk/qpg_executable.gni (1651007143800012937 vs 1651007267243517127)
[0/1] Regenerating ninja files
ninja explain: output lock_app.out.ota doesn't exist
ninja explain: lock_app.out.ota is dirty
[1/2] ACTION //:lock_app.out.ota(//third_party/connectedhomeip/build/toolchain/arm_gcc:arm_gcc)

Change overview

Fix the filename (and squelch the output).

Testing

(cd ./examples/lock-app/qpg; gn gen out/debug; ninja -C out/debug)

[github-actions]

PR #17786: Size comparison from 6c54ab8 to 1b25f9e

Full report (15 builds for cc13x2_26x2, efr32, esp32, mbed, nrfconnect, p6)

platform	target	config	section	6c54ab8	1b25f9e	change	% change
cc13x2_26x2	all-clusters-app	LP_CC2652R7	(read only)	688215	688215	0	0.0
			(read/write)	163824	163824	0	0.0
			.bss	75020	75020	0	0.0
			.data	3396	3396	0	0.0
			.rodata	101583	101583	0	0.0
			.text	586152	586152	0	0.0
	lock-ftd	LP_CC2652R7	(read only)	688783	688783	0	0.0
			(read/write)	154568	154568	0	0.0
			.bss	73388	73388	0	0.0
			.data	3220	3220	0	0.0
			.rodata	103175	103175	0	0.0
			.text	585124	585124	0	0.0
	lock-mtd	LP_CC2652R7	(read only)	637535	637535	0	0.0
			(read/write)	146188	146188	0	0.0
			.bss	69108	69108	0	0.0
			.data	3220	3220	0	0.0
			.rodata	103055	103055	0	0.0
			.text	533988	533988	0	0.0
	pump-app	LP_CC2652R7	(read only)	661635	661635	0	0.0
			(read/write)	182916	182916	0	0.0
			.bss	73564	73564	0	0.0
			.data	3252	3252	0	0.0
			.rodata	80371	80371	0	0.0
			.text	580784	580784	0	0.0
	pump-controller-app	LP_CC2652R7	(read only)	654523	654523	0	0.0
			(read/write)	189820	189820	0	0.0
			.bss	73612	73612	0	0.0
			.data	3216	3216	0	0.0
			.rodata	83395	83395	0	0.0
			.text	570648	570648	0	0.0
efr32	lighting-app	BRD4161A	(read only)	907612	907612	0	0.0
			(read/write)	134908	134908	0	0.0
			.bss	132864	132864	0	0.0
			.data	2044	2044	0	0.0
			.text	907604	907604	0	0.0
		BRD4161A+rpc	(read only)	942028	942028	0	0.0
			(read/write)	151592	151592	0	0.0
			.bss	149344	149344	0	0.0
			.data	2248	2248	0	0.0
			.text	942020	942020	0	0.0
	window-app	BRD4161A	(read only)	844996	844996	0	0.0
			(read/write)	132996	132996	0	0.0
			.bss	131040	131040	0	0.0
			.data	1956	1956	0	0.0
			.text	844988	844988	0	0.0
esp32	all-clusters-app	c3devkit	(read only)	999324	999324	0	0.0
			(read/write)	1473618	1473618	0	0.0
			.dram0.bss	68176	68176	0	0.0
			.dram0.data	14428	14428	0	0.0
			.flash.rodata	206568	206568	0	0.0
			.flash.text	999324	999324	0	0.0
			.iram0.text	62020	62020	0	0.0
		m5stack	(read only)	1053619	1053619	0	0.0
			(read/write)	475616	475616	0	0.0
			.dram0.bss	73696	73696	0	0.0
			.dram0.data	34168	34168	0	0.0
			.flash.rodata	235916	235916	0	0.0
			.flash.text	1048235	1048235	0	0.0
			.iram0.text	123107	123107	0	0.0
mbed	lock-app	CY8CPROTO_062_4343W+release	(read only)	6224	6224	0	0.0
			(read/write)	2411508	2411508	0	0.0
			.bss	205660	205660	0	0.0
			.data	5848	5848	0	0.0
			.text	1374108	1374108	0	0.0
nrfconnect	all-clusters-app	nrf52840dk_nrf52840	(read/write)	1179243	1179243	0	0.0
			bss	141784	141784	0	0.0
			rodata	150204	150204	0	0.0
			text	808616	808616	0	0.0
p6	all-clusters-app	default	(read/write)	2526920	2526920	0	0.0
			.bss	139040	139040	0	0.0
			.data	2784	2784	0	0.0
			.text	1485184	1485184	0	0.0
	light-app	default	(read/write)	2418680	2418680	0	0.0
			.bss	132520	132520	0	0.0
			.data	2584	2584	0	0.0
			.text	1376944	1376944	0	0.0
	lock-app	default	(read/write)	2422856	2422856	0	0.0
			.bss	132320	132320	0	0.0
			.data	2544	2544	0	0.0
			.text	1381120	1381120	0	0.0