Use NULL for nick/blurb in GObject params

As they are only used by gstreamer for gst-inspect & other tools.
Projects like Mutter/gtk have completely dropped them as well, so follow
their path

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/3505>

js/ui/appDisplay.js

@@ -159,7 +159,7 @@ function _findBestFolderName(apps) {
 export const AppGrid = GObject.registerClass({
     Properties: {
         'indicators-padding': GObject.ParamSpec.boxed('indicators-padding',
-            'Indicators padding', 'Indicators padding',
+            null, null,
             GObject.ParamFlags.READWRITE,
             Clutter.Margin.$gtype),
     },
@@ -484,7 +484,7 @@ var BaseAppView = GObject.registerClass({
     GTypeFlags: GObject.TypeFlags.ABSTRACT,
     Properties: {
         'gesture-modes': GObject.ParamSpec.flags(
-            'gesture-modes', 'gesture-modes', 'gesture-modes',
+            'gesture-modes', null, null,
             GObject.ParamFlags.READWRITE | GObject.ParamFlags.CONSTRUCT_ONLY,
             Shell.ActionMode, Shell.ActionMode.OVERVIEW),
     },