Code review comment for lp://qastaging/~smspillaz/unity/unity.fix_943456

Somehow seems to cause an issue when re-focusing a terminal/sometimes other windows - the terminal gets pushed to an edge, either top or bottom in my experience, confirmed through neil also if you need testers/can't reproduce.

A bit of debugging i noticed that if i removed the PluginAdapter::restoreInputFocus() call from HUDs hide method the issue no longer happens. of course the previously focused window no longer recieves focus when the hud closes if this method is removed.