Codechange: Turn AnimationTrigger enums into enum classes. (#14067)

src/waypoint_cmd.cpp

@@ -405,7 +405,7 @@ CommandCost CmdBuildRoadWaypoint(DoCommandFlags flags, TileIndex start_tile, Axi
 		if (roadstopspec != nullptr) {
 			/* Include this road stop spec's animation trigger bitmask
 			 * in the station's cached copy. */
-			wp->cached_roadstop_anim_triggers |= roadstopspec->animation.triggers;
+			wp->cached_roadstop_anim_triggers.Set(roadstopspec->animation.triggers);
 		}
 
 		wp->delete_ctr = 0;