Do not bind 'negate' since the functionality is already provided by unary minus

engine/lua/LuaVector2.cpp

@@ -287,7 +287,6 @@ void load_vector2(LuaEnvironment& env)
 	env.load_module_function("Vector2", "squared_length",		vector2_squared_length);
 	env.load_module_function("Vector2", "set_length",			vector2_set_length);
 	env.load_module_function("Vector2", "normalize",			vector2_normalize);
-	env.load_module_function("Vector2", "negate",				vector2_negate);
 	env.load_module_function("Vector2", "distance",				vector2_distance);
 	env.load_module_function("Vector2", "angle",				vector2_angle);
 }

engine/lua/LuaVector3.cpp

@@ -328,7 +328,6 @@ void load_vector3(LuaEnvironment& env)
 	env.load_module_function("Vector3", "squared_length", 	vector3_squared_length);
 	env.load_module_function("Vector3", "set_length", 		vector3_set_length);
 	env.load_module_function("Vector3", "normalize", 		vector3_normalize);
-	env.load_module_function("Vector3", "negate", 			vector3_negate);
 	env.load_module_function("Vector3", "distance", 		vector3_distance);
 	env.load_module_function("Vector3", "angle",			vector3_angle);
 }