fix: format lua and highlight latex functions

lua/midnight/init.lua

@@ -4,7 +4,9 @@ local loading = false
 
 ---@return nil
 function M.load()
-  if loading then return end
+  if loading then
+    return
+  end
   loading = true
 
   if vim.g.colors_name then

lua/midnight/theme.lua

@@ -165,6 +165,8 @@ function M.apply()
   hi('@constructor.lua', { fg = cs.background })
   hi('@markup.heading.gitcommit', { none = true })
 
+  hi('@function.latex', { fg = cs.blue })
+
   hi('GitSignsCurrentLineBlame', { italic = true, fg = cs.light_black })
   link('DiffAdd', 'GitSignsAdd')
   link('DiffChange', 'GitSignsChange')