Fix lighting of the wield mesh (#12341)

* Assign node light to player before final color blend.
  Fixes day/night lightbank ratio for wield meshes
* Update wield mesh light when changing mesh

src/client/clientenvironment.cpp

@@ -305,6 +305,7 @@ void ClientEnvironment::step(float dtime)
 		node_at_lplayer = m_map->getNode(p);
 
 		u16 light = getInteriorLight(node_at_lplayer, 0, m_client->ndef());
+		lplayer->light_color = encode_light(light, 0); // this transfers light.alpha
 		final_color_blend(&lplayer->light_color, light, day_night_ratio);
 	}