cleanup: Use null for nick/blurb in ParamSpecs

As they are only used by gstreamer for gst-inspect & other tools.
Projects like mutter and gtk have already completely dropped them,
so follow their lead.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell-extensions/-/merge_requests/347>
(cherry picked from commit 46a4fa0976)

extensions/auto-move-windows/prefs.js

@@ -45,11 +45,11 @@ class NewItemModel extends GObject.Object {
 class Rule extends GObject.Object {
     static [GObject.properties] = {
         'app-info': GObject.ParamSpec.object(
-            'app-info', 'app-info', 'app-info',
+            'app-info', null, null,
             GObject.ParamFlags.READWRITE,
             Gio.DesktopAppInfo),
         'workspace': GObject.ParamSpec.uint(
-            'workspace', 'workspace', 'workspace',
+            'workspace', null, null,
             GObject.ParamFlags.READWRITE,
             1, WORKSPACE_MAX, 1),
     };
@@ -196,7 +196,7 @@ class AutoMoveSettingsWidget extends Adw.PreferencesGroup {
 class WorkspaceSelector extends Gtk.Widget {
     static [GObject.properties] = {
         'number': GObject.ParamSpec.uint(
-            'number', 'number', 'number',
+            'number', null, null,
             GObject.ParamFlags.READWRITE,
             1, WORKSPACE_MAX, 1),
     };

extensions/window-list/extension.js

@@ -172,7 +172,7 @@ class BaseButton extends DashItemContainer {
             GTypeFlags: GObject.TypeFlags.ABSTRACT,
             Properties: {
                 'ignore-workspace': GObject.ParamSpec.boolean(
-                    'ignore-workspace', 'ignore-workspace', 'ignore-workspace',
+                    'ignore-workspace', null, null,
                     GObject.ParamFlags.READWRITE,
                     false),
             },

extensions/workspace-indicator/workspaceIndicator.js

@@ -113,11 +113,11 @@ class WorkspaceLayout extends Clutter.LayoutManager {
 class WorkspaceThumbnail extends St.Button {
     static [GObject.properties] = {
         'active': GObject.ParamSpec.boolean(
-            'active', '', '',
+            'active', null, null,
             GObject.ParamFlags.READWRITE,
             false),
         'show-label': GObject.ParamSpec.boolean(
-            'show-label', '', '',
+            'show-label', null, null,
             GObject.ParamFlags.READWRITE,
             false),
     };
@@ -311,7 +311,7 @@ class WorkspaceThumbnail extends St.Button {
 class WorkspacePreviews extends Clutter.Actor {
     static [GObject.properties] = {
         'show-labels': GObject.ParamSpec.boolean(
-            'show-labels', '', '',
+            'show-labels', null, null,
             GObject.ParamFlags.READWRITE | GObject.ParamFlags.CONSTRUCT_ONLY,
             false),
     };