Fix can_move being set up too early

As in, before element properties were populated. This broke everything that depended on can_move, probably most notably particle displacement based on the Weight property. It didn't help that once element properties were populated, any secondary call to init_can_move would fix the symptoms, such as when any custom element is added with Lua.

src/simulation/SimulationData.cpp

@@ -333,9 +333,9 @@ int SimulationData::GetParticleType(ByteString type) const
 
 SimulationData::SimulationData()
 {
-	init_can_move();
 	msections = LoadMenus();
 	wtypes = LoadWalls();
 	elements = GetElements();
 	tools = GetTools();
+	init_can_move();
 }