Improve sidebar indentation and shortpath behavior.

The previous implementation only enabled $sidebar_folder_indent for
mailboxes underneath $folder.  Change indentation to be based upon the
previous common-path mailbox in the list.  Indent one more than the
common-path mailbox, rather than the number of delimiters after
$folder.

Change $sidebar_short_path to shorten based on the previous mailbox in
the list too.

Invoke mutt_buffer_pretty_mailbox() to prefix the mailbox with '~' or
'=' characters.  This changes the output for the case where mailbox
equals $folder, but provides uniform display behavior across mutt.

Thanks to Christopher Zimmermann (@madroach) for the original patch,
which this commit is based upon.

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