magnifier: Fix (un)inhibiting unredirection

The methods for (un)inhibiting unredirection are on the compositor,
not the display.

Fixes: 4034e69d0d ("Adapt to fixed Meta functions namespace")
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/3575>

js/ui/magnifier.js

@@ -186,12 +186,12 @@ export class Magnifier extends Signals.EventEmitter {
             this._updateMouseSprite();
             this._cursorTracker.connectObject(
                 'cursor-changed', this._updateMouseSprite.bind(this), this);
-            global.display.disable_unredirect();
+            global.compositor.disable_unredirect();
             this.startTrackingMouse();
         } else {
             this._cursorTracker.disconnectObject(this);
             this._mouseSprite.content.texture = null;
-            global.display.enable_unredirect();
+            global.compositor.enable_unredirect();
             this.stopTrackingMouse();
         }