places-menu: Use spread operator for variadic function

Invoking functions via Function.prototype.apply() and .call() is
less performant than a regular function call, and makes code harder
to read.

Before ES6 there was no other way of writing a function with variadic
arguments, but since we now have the spread operator, we can use that
as the better alternative.

https://gitlab.gnome.org/GNOME/gnome-shell-extensions/merge_requests/91

extensions/places-menu/placeDisplay.js

@@ -20,8 +20,8 @@ const Hostname1Iface = '<node> \
 const Hostname1 = Gio.DBusProxy.makeProxyWrapper(Hostname1Iface);
 
 class PlaceInfo {
-    constructor() {
-        this._init.apply(this, arguments);
+    constructor(...params) {
+        this._init(...params);
     }
 
     _init(kind, file, name, icon) {