MythPlayer: Don't automatically mark a recording as 'unwatched'.

The setting help text clearly states that it is for automatically
marking as watched and unsetting the watched flag is counter-intuitive
and likely to confuse - so leave it to the user to mark as unwatched
from the Watch Recordings Screen.

Closes #9999

Author: Mark Kendall

mythtv/libs/libmythtv/mythplayer.cpp

@@ -3186,11 +3186,6 @@ void MythPlayer::SetWatched(bool forceWatched)
             QString("Marking recording as watched using offset %1 minutes")
                 .arg(offset/60));
     }
-    else
-    {
-        player_ctx->playingInfo->SaveWatched(false);
-        LOG(VB_GENERAL, LOG_INFO, LOC + "Marking recording as unwatched");
-    }
 
     player_ctx->UnlockPlayingInfo(__FILE__, __LINE__);
 }