Now that 'Consumer_Mute' is no longer blocked by 'is_internal', we can

switch back to using it, to get a working mute toggle on linux, windows
and osx.

Author: obra

Model01-Firmware.ino

@@ -169,7 +169,7 @@ const Key keymaps[][ROWS][COLS] PROGMEM = {
    Consumer_ScanPreviousTrack, Key_F6,                 Key_F7,                   Key_F8,                   Key_F9,          Key_F10,          Key_F11,
    Consumer_PlaySlashPause,    Consumer_ScanNextTrack, Key_LeftCurlyBracket,     Key_RightCurlyBracket,    Key_LeftBracket, Key_RightBracket, Key_F12,
                                Key_LeftArrow,          Key_DownArrow,            Key_UpArrow,              Key_RightArrow,  ___,              ___,
-   Key_PcApplication,          Key_Mute,               Consumer_VolumeDecrement, Consumer_VolumeIncrement, ___,             Key_Backslash,    Key_Pipe,
+   Key_PcApplication,          Consumer_Mute,          Consumer_VolumeDecrement, Consumer_VolumeIncrement, ___,             Key_Backslash,    Key_Pipe,
    ___, ___, Key_Enter, ___,
    ___)