Cannot pass args to PW modules from lua

load_components() in module-lua-scripting only accepts a LUA_TTABLE as the args argument. However, load_pw_module() only accepts a G_VARIANT_TYPE_STRING as module args. A LUA_TTABLE is converted to a G_VARIANT_TYPE_VARDICT. Therefore, there is no valid type that will actually be passed as args to the module load.