cleanup: Use consistent 4-space indent

This is another bit where we've made good progress, and just need
a final push to complete the transition.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2866>

js/ui/components/networkAgent.js

@@ -480,7 +480,7 @@ class VPNRequestHandler extends Signals.EventEmitter {
                 this._readStdoutOldStyle();
 
             this._childWatch = GLib.child_watch_add(GLib.PRIORITY_DEFAULT, pid,
-                                                    this._vpnChildFinished.bind(this));
+                this._vpnChildFinished.bind(this));
 
             this._writeConnection();
         } catch (e) {