ZMMiniPlayer::keyPressEvent shouldn't call up twice.

The parent ZMLivePlayer::keyPressEvent function already calls the
grandparent MythScreenType::keyPressEvent function. There's no need to
directly call it a second time.

This issue was pointed out by the clang-tidy
bugprone-parent-virtual-call check.

mythplugins/mythzoneminder/mythzoneminder/zmminiplayer.cpp

@@ -146,8 +146,5 @@ bool ZMMiniPlayer::keyPressEvent(QKeyEvent *event)
     if (!handled && ZMLivePlayer::keyPressEvent(event))
         handled = true;
 
-    if (!handled && MythScreenType::keyPressEvent(event))
-        handled = true;
-
     return handled;
 }