tools: ensure failed daily wpt run still generates a report

PR-URL: #47376
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>

Makefile

@@ -592,7 +592,7 @@ test-wpt: all
 test-wpt-report:
 	$(RM) -r out/wpt
 	mkdir -p out/wpt
-	WPT_REPORT=1 $(PYTHON) tools/test.py --shell $(NODE) $(PARALLEL_ARGS) wpt
+	-WPT_REPORT=1 $(PYTHON) tools/test.py --shell $(NODE) $(PARALLEL_ARGS) wpt
 	$(NODE) "$$PWD/tools/merge-wpt-reports.mjs"
 
 .PHONY: test-internet