Standardize parenthesis usage for is_deployed

plugins/ps/functions

@@ -135,7 +135,7 @@ ps_restart() {
   local APP="$1"; verify_app_name "$APP"
   local IMAGE_TAG=$(get_running_image_tag "$APP")
 
-  if is_deployed "$APP"; then
+  if (is_deployed "$APP"); then
     release_and_deploy "$APP" "$IMAGE_TAG"
   else
     echo "App $APP has not been deployed"

plugins/ps/subcommands/rebuildall

@@ -7,7 +7,7 @@ ps_rebuildall_cmd() {
   declare desc="rebuilds all deployed apps via command line"
   local cmd="ps:rebuildall"
   for app in $(dokku_apps); do
-    is_deployed "$app" && ps_rebuild "$app"
+    (is_deployed "$app") && ps_rebuild "$app"
   done
 }