trailing text remove its parent class that doesn not exist in python input type

common/lib/xmodule/xmodule/css/capa/display.scss

@@ -818,11 +818,9 @@ div.problem {
     }
   }
 
-  .capa_inputtype.textline.text-input-dynamath, .inputtype.formulaequationinput {
   .trailing_text {
     display: inline-block;
   }
-  }
 }