fix：课酬

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

@@ -643,9 +643,9 @@ public class CourseScheduleTeacherSalaryServiceImpl extends BaseServiceImpl<Long
                     deductCost = deductCost.add(teacherSalary);
                     deductReasons.add("早退扣除全部课酬");
                 }else{
-                    //异常签退，扣除一半课酬
-                    deductCost = deductCost.add(teacherSalary.divide(new BigDecimal(2)));
-                    deductReasons.add("异常签退，扣除一半课酬");
+                    //异常签退，扣除50元
+                    deductCost = deductCost.add(new BigDecimal(50));
+                    deductReasons.add("异常签退，扣除50元");
                 }
             }