fix 中途插入学生，没有保证金

mec-biz/src/main/java/com/ym/mec/biz/service/impl/MusicGroupServiceImpl.java

@@ -465,6 +465,7 @@ public class MusicGroupServiceImpl extends BaseServiceImpl<String, MusicGroup> i
                         throw new BizException("乐器提供方式不存在");
                     }
                     goodsGroup.setPrice(new BigDecimal(0));
+                    goodsGroup.setKitGroupPurchaseType(KitGroupPurchaseTypeEnum.FREE);
                     remitFee = groupType.get("FREE");
                 }
                 if (goodsGroup.getType().equals(GoodsType.INSTRUMENT)) {
@@ -700,6 +701,7 @@ public class MusicGroupServiceImpl extends BaseServiceImpl<String, MusicGroup> i
                         throw new BizException("乐器提供方式不存在");
                     }
                     goodsGroup.setPrice(new BigDecimal(0));
+                    goodsGroup.setKitGroupPurchaseType(KitGroupPurchaseTypeEnum.FREE);
                     remitFee = groupType.get("FREE");
                 }
                 if (goodsGroup.getType().equals(GoodsType.INSTRUMENT)) {