WebUI: disallow unnecessary quotes in property name

Those two forms are the same and from now on we enforce to one style.

PR #22051.

src/webui/www/private/views/rss.html

@@ -883,8 +883,8 @@
                     saveWindowSize(id);
                 }),
                 resizeLimit: {
-                    "x": [800, 2500],
-                    "y": [500, 2000]
+                    x: [800, 2500],
+                    y: [500, 2000]
                 }
             });
         };