remove redundant curses calls

[an-prata]

Every time miniplayer closes there's an error from a curses call - looks like its because the curses.endwin() function is called twice, once in the Player.loop() function, and again the the finally clause at the end of the script. PR removes the call in Player.loop() as the call at the script's end should be made every time the program exits. Removing the duplicate call prevents curses from throwing on quit.