fixed discussion search cursor bug

lms/static/sass/_discussion.scss

@@ -940,7 +940,7 @@ body.discussion {
       display: block;
       width: 100%;
       height: 30px;
-      padding: 0;
+      padding: 0 0 0 30px;
       margin: 14px auto;
       @include box-sizing(border-box);
       border: 1px solid #acacac;
@@ -951,7 +951,6 @@ body.discussion {
       font-weight: 400;
       font-size: 13px;
       line-height: 20px;
-      text-indent: 30px;
       color: #333;
       outline: 0;
       cursor: pointer;