Fix finding the extension type for Lua plugin
Fix finding the extension type for Lua plugin

If the module's table had multiple extensions we would
leak the key and value on the stack.
gregier/libpeas,GNOME/libpeas,gregier/libpeas,chergert/libpeas,gregier/libpeas,Distrotech/libpeas,GNOME/libpeas,Distrotech/libpeas,chergert/libpeas,Distrotech/libpeas,chergert/libpeas,gregier/libpeas