Trust that script -x flags will always be set (MarlinFirmware#20453)

Author: sjasonsmith

Makefile

@@ -27,8 +27,6 @@ tests-single-ci:
 
 tests-single-local:
 	@if ! test -n "$(TEST_TARGET)" ; then echo "***ERROR*** Set TEST_TARGET=<your-module> or use make tests-all-local" ; return 1; fi
-	chmod +x buildroot/bin/*
-	chmod +x buildroot/tests/*
 	export PATH=./buildroot/bin/:./buildroot/tests/:${PATH} \
 	  && export VERBOSE_PLATFORMIO=$(VERBOSE_PLATFORMIO) \
 	  && run_tests . $(TEST_TARGET) "$(ONLY_TEST)"
@@ -40,8 +38,6 @@ tests-single-local-docker:
 .PHONY: tests-single-local-docker
 
 tests-all-local:
-	chmod +x buildroot/bin/*
-	chmod +x buildroot/tests/*
 	export PATH=./buildroot/bin/:./buildroot/tests/:${PATH} \
 	  && export VERBOSE_PLATFORMIO=$(VERBOSE_PLATFORMIO) \
 	  && for TEST_TARGET in $$(./get_test_targets.py) ; do echo "Running tests for $$TEST_TARGET" ; run_tests . $$TEST_TARGET ; done