Run (go mod tidy) before (go mod vendor) again

We switched the order because (go mod tidy) seemed not to work
before, but the reason why it didn't work was only tangentially
the ordering, and now that all commands do work, modifying the set
of modules makes more sense before updating the vendor directory.

Signed-off-by: Miloslav Trmač <mitr@redhat.com>

Makefile

@@ -142,8 +142,8 @@ vendor-in-container:
 
 .PHONY: vendor
 vendor:
-	GO111MODULE=on $(GO) mod vendor
 	GO111MODULE=on $(GO) mod tidy
+	GO111MODULE=on $(GO) mod vendor
 	GO111MODULE=on $(GO) mod verify
 
 .PHONY: lint