TOOLS/umpv, mpv.desktop: use --no-terminal instead of --really-quiet

So this won't initialize terminal handling if stdout happens to be a
terminal. It also suppresses all output to stdout/stderr.

TOOLS/umpv

@@ -96,7 +96,7 @@ else:
             raise e
     os.mkfifo(FIFO, int("0600", 8))
 
-    opts = ["mpv", "--really-quiet", "--force-window", "--input-file=" + FIFO]
+    opts = ["mpv", "--no-terminal", "--force-window", "--input-file=" + FIFO]
     opts.extend(opts_env)
     opts.append("--")
     opts.extend(files)

etc/mpv.desktop

@@ -19,7 +19,7 @@ Comment[ru]=Воспроизвести фильмы и музыку
 Comment[zh]=多媒体播放器
 Icon=mpv
 TryExec=mpv
-Exec=mpv --really-quiet --force-window -- %U
+Exec=mpv --no-terminal --force-window -- %U
 Terminal=false
 NoDisplay=true
 Categories=AudioVideo;Audio;Video;Player;TV;