vimrc: Add `<leader>db` mapping to open files with TBuffer using Pick

I've been using my `TBuffer` command recently, but don't like how I have
to type out parts of the file name interspersed with "*"s, and press
`<Tab>` to ensure I'm getting the right file in case there are multiple
matches.

Make it easier to use `TBuffer` by allowing fuzzy finding with Pick.
This allows us to filter the list of buffers, choosing one to pass to
`TBuffer`.

Used the buffer list because the function is readily available, and
because there's no easy way to get a list of all buffer names in all
tabs. I'd probably have to map over `gettabinfo()`, and get the buffer
name for each window. Or manually filter the `:tabs` output.

Chose `db` because `dt` is taken for opening a file in a new tab, and
the word "tab" ends in "b". Now that I think about it, though, this
command deals with buffers, so it probably makes more sense to put it
under the "b" namespace.

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