style: Fix brace style

Opening braces should be on the same line as the associated statement,
and only be omitted if both surrounding blocks are one-liners.

Partially spotted by eslint.

https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/607

js/ui/status/network.js

@@ -498,8 +498,9 @@ var NMDeviceWired = class extends NMConnectionDevice {
             } else {
                 return 'network-wired-disconnected-symbolic';
             }
-        } else
+        } else {
             return 'network-wired-disconnected-symbolic';
+        }
     }
 };