Add missing 'start/endWrite' calls for SSD1963 brightness (#599) #796

Job	Run time
esp32@2.0.15	1m 9s
esp32@2.0.16	1m 20s
esp32@2.0.17	1m 9s
esp32s2@2.0.15	1m 10s
esp32s2@2.0.16	1m 6s
esp32s2@2.0.17	1m 22s
m5stick-c@2.0.15	1m 6s
m5stick-c@2.0.16	1m 9s
m5stick-c@2.0.17	1m 22s
m5stack-core-esp32@2.0.15	1m 22s
m5stack-core-esp32@2.0.16	1m 21s
m5stack-core-esp32@2.0.17	1m 22s
m5stack-core2@2.0.15	1m 22s
m5stack-core2@2.0.16	1m 30s
m5stack-core2@2.0.17	1m 10s
esp32s3box@2.0.15	1m 11s
esp32s3box@2.0.16	1m 9s
esp32s3box@2.0.17	1m 12s
d1_mini:eesz=4M3M,xtal=80@3.0.1	1m 4s
d1_mini:eesz=4M3M,xtal=80@3.0.2	1m 11s
seeed_wio_terminal@1.8.2	57s
adafruit_hallowing@1.7.10	1m 20s
adafruit_hallowing_m4@1.7.10	1m 23s
adafruit_pybadge_m4@1.7.10	1m 25s
adafruit_pygamer_m4@1.7.10	1m 22s
adafruit_feather_esp32s2_tft@latest	2m 2s
adafruit_feather_esp32s3_tft@latest	2m 12s
adafruit_funhouse_esp32s2@latest	1m 58s
rpipico@2.3.3	57s
esp32@latest	2m 2s
esp32s2@latest	1m 57s
esp32s3@latest	2m 7s
esp32c6@latest	1m 54s
esp32c3@latest	1m 53s
	48m 16s

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