[ncplayer] erase() standard plane for frame count

src/player/play.cpp

@@ -66,6 +66,8 @@ auto perframe(struct ncvisual* ncv, struct ncvisual_options* vopts,
     marsh->blitter = ncvisual_media_defblitter(nc, vopts->scaling);
   }
   if(!marsh->quiet){
+    // FIXME put this on its own plane if we're going to erase()ing it
+    stdn->erase();
     stdn->printf(0, NCAlign::Left, "frame %06d (%s)", marsh->framecount,
                  notcurses_str_blitter(vopts->blitter));
   }