feat: Change input events to fix unhovering when having a site on the parent process, b=no-bug, c=compact-mode

src/zen/compact-mode/ZenCompactMode.mjs

@@ -607,7 +607,7 @@ var gZenCompactModeManager = {
       target.addEventListener('mouseover', onEnter);
       target.addEventListener('dragover', onEnter);
 
-      target.addEventListener('mouseout', onLeave);
+      target.addEventListener('mouseleave', onLeave);
       target.addEventListener('dragleave', onLeave);
     }