Update to TileMapLayer in Multiplayer Bomber demo (#1155)

networking/multiplayer_bomber/tileset.tres

@@ -6,12 +6,8 @@
 texture = ExtResource("1")
 texture_region_size = Vector2i(48, 48)
 0:0/0 = 0
-0:0/0/physics_layer_0/linear_velocity = Vector2(0, 0)
-0:0/0/physics_layer_0/angular_velocity = 0.0
 0:0/0/physics_layer_0/polygon_0/points = PackedVector2Array(-24, -24, 24, -24, 24, 24, -24, 24)
 1:0/0 = 0
-1:0/0/physics_layer_0/linear_velocity = Vector2(0, 0)
-1:0/0/physics_layer_0/angular_velocity = 0.0
 
 [resource]
 tile_size = Vector2i(48, 48)