fix(ui/skillBox): 修复技能选择框布局与文本问题

调整了技能框预制体的节点位置、尺寸、字体大小，新增了标题文本"选择战斗技能"，修正了资源引用id和布局偏移量，优化界面显示效果

assets/resources/gui/element/MSkillBox.prefab

@@ -28,17 +28,17 @@
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