browsercolumn: Include linum_text_len in key

The width of an item needs to be recalculated if the width of the line
numbers changes. This happens every time we get to another order of
magnitude (an additional digit).

This is based on [review
comments](https://github.com/ranger/ranger/pull/2346#issuecomment-1062257526)
from markus-bauer. The solution opted for here is basically their second
bullet point. I tried the third bullet point first, replacing
`line_numbers` by `linum_text_len` in the key but this requires
recalculating `linum_text_len` to be zero when line numbers are
disabled, which feels like a somewhat clunky overloading while we have a
perfectly usable boolean flag available.

Closes #2346

Co-authored-by: markus-bauer <mail.markus.bauer@gmail.com>

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