selftests: module: fix help target typo

This typo prevent helper to show up when make help is invoked and
CONFIG_SELFTESTS_SECTION_MODULE is enabled.

Signed-off-by: Daniel Gomez <[email protected]>

Author: dkruces

workflows/selftests/tests/Makefile.module

@@ -4,5 +4,5 @@ selftests-module:
 	$(Q)$(MAKE) selftests-baseline HOSTS=$(KDEVOPS_HOSTS_PREFIX)-module
 endif
 
-selftests-help-menu-target-modules:
+selftests-help-menu-target-module:
 	@echo "selftests-module                 - Runs selftests for module"