style:答题详情样式修改

src/modules/teach-tool/examination-manager/TestDetailPage.less

@@ -277,10 +277,6 @@
             }
             }
           }
           }
         }
         }
-        .result-content::after {
-          content: '';
-          flex: auto;
-        }
       }
       }
     }
     }
   }
   }