cleanup: Only omit braces for single-line blocks

Braces can be avoided when a block consists of a single statement,
but readability suffers when the statement spans more than a single
line.

https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/805

js/ui/environment.js

@@ -40,7 +40,7 @@ function _patchContainerClass(containerClass) {
 }
 
 function _patchLayoutClass(layoutClass, styleProps) {
-    if (styleProps)
+    if (styleProps) {
         layoutClass.prototype.hookup_style = function (container) {
             container.connect('style-changed', () => {
                 let node = container.get_theme_node();
@@ -51,6 +51,7 @@ function _patchLayoutClass(layoutClass, styleProps) {
                 }
             });
         };
+    }
 }
 
 function _makeEaseCallback(params, cleanup) {