修复表格表头颜色错误

template/src/oj/submission/problem_my_submissions_list.html

@@ -25,7 +25,7 @@
         {% if submissions %}
         <table class="table table-bordered">
             <thead>
-            <tr class="success">
+            <tr>
                 <th>#</th>
                 <th>提交时间</th>
                 <th>语言</th>