Terminate Live TV channel input with SELECT

In Live TV another channel can be selected by typing in the channel number.
The selection takes effect five seconds after the first character has been entered.
The channel number input can now be terminated by a SELECT action (the Enter key).

mythtv/libs/libmythtv/tv_play.cpp

@@ -3952,6 +3952,10 @@ bool TV::ActiveHandleAction(const QStringList &Actions,
     else if (!IsDVDStillFrame && SeekHandleAction(Actions, IsDVD))
     {
     }
+    else if (IsActionable(ACTION_SELECT, Actions))
+    {
+        CommitQueuedInput();
+    }
     else
     {
         handled = false;