fix(skill tooltip): adjust tooltip vertical offset from 30 to 60

fix the issue that skill tooltip might be blocked by health bar

assets/script/game/skill/TooltipCom.ts

@@ -90,7 +90,7 @@ export class TooltipCom extends CCComp {
         const topSiblingIndex = 9999; 
 
         // 临时变量，存储当前Y坐标，方便统一处理。增加60的Y轴基础偏移，防止伤害飘字等遮挡血条
-        let currentY = this.node.position.y + 30;
+        let currentY = this.node.position.y + 60;
 
         switch (this.stype) {
             case TooltipTypes.life: // 普通伤害