theme: size none color is not respected

- os:
- `lsd --version`: lsd 0.23.1
- `echo $TERM`: xterm-256color
- `echo $LS_COLORS`: fi=00:mi=00:mh=00:ln=01;36:or=01;31:di=01;34:ow=04;01;34:st=34:tw=04;34:pi=01;33:so=01;33:do=01;33:bd=01;33:cd=01;33:su=01;35:sg=01;35:ca=01;35:ex=01;32:no=38;5;248

## Expected behavior
I expect that size none color is for zero size objects.

## Actual behavior
I added a theme, changed color for small size — worked. Changed color for none — don't see that color, color for zero size files is the same as for small ones.

Start by reproducing the behavior with lsd 0.23.1 using a theme that assigns different colors to small and none sizes. Trace the size-color handling and verify that zero-size files use the none color rather than the small-size color.

Written by the indexing model from the issue text.