Fix editor grid perspective undefined behaviour

Initialise the enum value

editor/plugins/node_3d_editor_plugin.h

@@ -532,7 +532,7 @@ private:
 	bool grid_enable[3]; //should be always visible if true
 	bool grid_enabled;
 	bool grid_init_draw = false;
-	Camera3D::Projection grid_camera_last_update_perspective;
+	Camera3D::Projection grid_camera_last_update_perspective = Camera3D::PROJECTION_PERSPECTIVE;
 	Vector3 grid_camera_last_update_position = Vector3();
 
 	Ref<ArrayMesh> move_gizmo[3], move_plane_gizmo[3], rotate_gizmo[4], scale_gizmo[3], scale_plane_gizmo[3];