Remap :Buffers shortcut to avoid clobbering `;`
Remap :Buffers shortcut to avoid clobbering `;`

In aa9955a8e27caa06bd23b2882b0b2685e4df5e01, I accidentally replaced the
useful `;` key with `:Buffers`, this fixes that mapping it to Leader-b
instead.

zefer/dotfiles,zefer/dotfiles