Main menu: Fix automatic dependency enables on doubleclick

When mods were toggled by double-click, the hard dependencies were no longer enabled automatically.
However, the 'Enabled' checkbox did still work. This commit restores the behaviour as seen before commit c401a06

builtin/mainmenu/pkgmgr.lua

@@ -435,6 +435,7 @@ function pkgmgr.enable_mod(this, toset)
  local toggled_mods = {}
  local enabled_mods = {}
  toggle_mod_or_modpack(list, toggled_mods, enabled_mods, toset, mod)
+ toset = mod.enabled -- Update if toggled
 
  if not toset then
  -- Mod(s) were disabled, so no dependencies need to be enabled