🐛 line-numbers-*-style from feature is ignored if line numbers are enabled elsewhere

[injust]

The Catppuccin theme used to enable line numbers for delta by default, but after discussion in catppuccin/delta#12, line numbers were disabled by default in catppuccin/delta@f294e84. The commit removed line-numbers = true in the feature, so the user could choose where to set --line-numbers themselves.

But when you run delta --line-numbers, you get non-Catppuccin line numbers.

This also happens if you add a feature for line numbers, e.g.

[delta "line-numbers"]
	line-numbers = true

and then run delta with DELTA_FEATURES=+line-numbers delta.

No matter how line numbers are enabled, it seems to override previously configured styles.