fix(btop): point color_theme at the deployed nomarchy.theme

themes/engine/loader.nix:72 deploys the active palette's btop theme to
~/.config/btop/themes/nomarchy.theme, but btop.conf had
color_theme = "current" — btop looked for themes/current.theme, didn't
find it, and silently fell back to the built-in Default theme. So every
palette rendered btop in the same default colors regardless of the
selected Nomarchy theme.

Renamed the config reference to match the deployed file name.

lazygit and tmux both inherit terminal ANSI colors (verified: the tmux
status bar config uses blue/brightblack/etc., not hex), so the kitty +
ghostty + alacritty theming changes from 8d3ce2d cover them
transitively — no module fix needed.

features/apps/btop/config/btop.conf

@@ -2,7 +2,7 @@
 
 #* Name of a btop++/bpytop/bashtop formatted ".theme" file, "Default" and "TTY" for builtin themes.
 #* Themes should be placed in "../share/btop/themes" relative to binary or "$HOME/.config/btop/themes"
-color_theme = "current"
+color_theme = "nomarchy"
 
 #* If the theme set background should be shown, set to False if you want terminal background transparency.
 theme_background = True