vis: remove lfs dependency

vis/.config/vis/visrc.lua

@@ -192,17 +192,10 @@ local function add_global_mark()
 	end
 end
 
-local lfs = require('lfs')
-local theme_modification = 0
 local last_theme = 'default'
 
 function set_current_theme()
 	local path = os.getenv('HOME') .. '/.config/xsettingsd/xsettingsd.conf'
-	local m = lfs.attributes(path, 'modification')
-	if m == theme_modification then
-		return
-	end
-	theme_modification = m
 	local f = io.open(path)
 	if f then
 		local s = f:read('*all')