Bug 1914035 - Avoid dynamic behavior for the engine view while in fullscreen r=android-reviewers,skhan

If the toolbar is dynamic we use a CoordinatorLayout behavior to synchronize the
toolbar and the engine view.
In fullscreen the toolbars are hidden so there is no need to continue observing
layout updates and try to synchronize the two views.
The proper behavior is already set again when exiting fullscreen.

Differential Revision: https://phabricator.services.mozilla.com/D224289

mobile/android/fenix/app/src/main/java/org/mozilla/fenix/browser/BaseBrowserFragment.kt

@@ -2367,6 +2367,7 @@ abstract class BaseBrowserFragment :
                 isVisible = false
             }
             val browserEngine = binding.swipeRefresh.layoutParams as CoordinatorLayout.LayoutParams
+            browserEngine.behavior = null
             browserEngine.bottomMargin = 0
             browserEngine.topMargin = 0
             binding.swipeRefresh.translationY = 0f