kodi: add m (mute) to kodi-remote script

packages/mediacenter/kodi/scripts/kodi-remote

@@ -13,6 +13,7 @@ Pause           p
 Screenshot      s
 Skin Debug      t
 Stop            x
+Mute            m
 Volume Down     -
 Volume Up       +
 Back            Backspace
@@ -36,6 +37,7 @@ while true; do
     d) com "PlayerDebug";;
     f) com "FullScreen";;
     i) com "Info";;
+    m) com "Mute";;
     o) com "CodecInfo";;
     p) com "Pause";;
     s) com "TakeScreenshot";;