Makefile: remove --mode=tools-node (k8gb-io#864)

New release of k3d-action solved the problem with importing images [k8gb-io#1020](k3d-io/k3d#1020).
We don't need to explicitly specify -mode=tools-node anymore, because this value is now the default.

Signed-off-by: kuritka <kuritka@gmail.com>

Makefile

@@ -141,7 +141,7 @@ deploy-test-version: ## Upgrade k8gb to the test version on existing clusters
 
 	@for c in $(CLUSTER_IDS); do \
 		echo -e "\n$(CYAN)$(CLUSTER_NAME)$$c:$(NC)" ;\
-		k3d image import $(REPO):$(SEMVER)-amd64 --mode=tools-node -c $(CLUSTER_NAME)$$c ;\
+		k3d image import $(REPO):$(SEMVER)-amd64 -c $(CLUSTER_NAME)$$c ;\
 	done
 
 	@for c in $(CLUSTER_IDS); do \