1. Don't enable mouse support if the user's terminal is configured to not
2. After calling bbs.receive_file() which displays a menu and uses sbbs's
internal mouse support, which enables a different mouse reporting mode,
disable the console.mouse_mode (sbbs's internal mouse support) before
re-enabling the mouse support for the avatar_chooser's own custom mouse
mode. Fix fixes issue #414 reported by Nelgin.
3. Fixed a typo in a message displayed to user if avatar upload failed.
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