test: fix INSTALL_OPERATOR missing value (codeready-toolchain#1218)

* fix

* fix

* requested changes

Author: rsoaresd

make/test.mk

@@ -41,9 +41,8 @@ TESTS_RUN_FILTER_REGEXP ?= ""
 
 .PHONY: test-e2e
 ## Run the e2e tests
-test-e2e: INSTALL_OPERATOR=true
 test-e2e: 
-	$(MAKE) prepare-e2e verify-migration-and-deploy-e2e e2e-run-parallel e2e-run e2e-run-metrics
+	$(MAKE) prepare-e2e verify-migration-and-deploy-e2e e2e-run-parallel e2e-run e2e-run-metrics INSTALL_OPERATOR=true
 	@echo "The tests successfully finished"
 	@echo "To clean the cluster run 'make clean-e2e-resources'"
 ifeq ($(CI),true)