fix(hero): 修正英雄和怪物初始默认动画为待机

调整HeroSpine组件的start方法初始调用为idle动画，修改怪物非下落场景下的默认状态从移动改为待机

assets/script/game/map/MissionMonComp.ts

@@ -60,7 +60,7 @@ export class MissionMonCompComp extends CCComp {
     /** 怪物出生掉落高度 */
     private static readonly MON_DROP_HEIGHT = 0;
     /** 3行高度偏移 (行距) */
-    private static readonly ROW_Y_OFFSETS = [80, 0, -80];
+    private static readonly ROW_Y_OFFSETS = [90, 0, -90];
 
     // ======================== 编辑器属性 ========================