test: revert fail coverage target if tests fail"

This reverts commit f216d5b.
Seems like it breaks the nightly job so reverting until
we figure that out.

PR-URL: #25543
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

Makefile

@@ -227,7 +227,7 @@ coverage-test: coverage-build
 	$(RM) out/$(BUILDTYPE)/obj.target/node_lib/gen/*.gcda
 	$(RM) out/$(BUILDTYPE)/obj.target/node_lib/src/*.gcda
 	$(RM) out/$(BUILDTYPE)/obj.target/node_lib/src/tracing/*.gcda
-	$(MAKE) $(COVTESTS)
+	-$(MAKE) $(COVTESTS)
 	mv lib lib__
 	mv lib_ lib
 	mkdir -p coverage .cov_tmp