[Toybox] [PATCH] vi.c: Backspace to merge lines when at beginning, get_endline is no more, cleanup

[Oliver Webb]

Looking at vi.c again, (I _know_ I can write code better then I did in October, and
since the cleanup pass hasn't happened yet I thought I'd start improving things now)
noticed there was no support for merging lines when doing a backspace at the start
of a line (e.g. deleting blank lines by pressing backspace) So I added that. There
is a bug where it will delete the last character of the line you are merging into,
Still. That behavior is considerably better than nothing (And dunno how to debug it,
vi_join isn't doing it's job for some reason) so I added it into the patch.

As far as ex commands go, this patch removes the function get_endline, and replaces it with directly
probing the buffer. Which is much faster then redrawing the page 2 times.

Other then that, This replaces a couple of variable names and removes a unnecessary goto

-   Oliver Webb <aquahobbyist at proton.me>
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