Don't require PULUMI_DEBUG_COMMANDS to be set to use local backend

This was an artifact of history. Since we'll be supporting the local
backend, we don't need yet another flag guarding it (you already have
to opt in with -c local:// which is enough of a hoop).

cmd/login.go

@@ -36,7 +36,7 @@ func newLoginCmd() *cobra.Command {
 			var b backend.Backend
 			var err error
 
-			if hasDebugCommands() && local.IsLocalBackendURL(cloudURL) {
+			if local.IsLocalBackendURL(cloudURL) {
 				b, err = local.Login(cmdutil.Diag(), cloudURL)
 			} else {
 				b, err = cloud.Login(commandContext(), cmdutil.Diag(), cloudURL)