Revert "#646 언어 선택 드롭다운 위에 툴팁 겹침 현상 수정 (#647)" (#651)

This reverts commit 6d2268d.

Author: wlsgur11

frontend/src/pages/oj/views/problem/problemSolving/problemSolvingComponent/CodeEditorHeader.vue

@@ -12,7 +12,7 @@
         gap: 10px;
       "
     >
-      <Tooltip :content="'언어 선택'" placement="top" :transfer="true">
+      <Tooltip :content="'언어 선택'" placement="top">
         <Dropdown @on-click="changeLanguage" trigger="click" class="dropdown">
           <span
             style="font-size: 13px; padding-right: 3px; font-weight: 450"

frontend/src/styles/iview-custom.less

@@ -1,10 +1,6 @@
 table {
   width: 100% !important;
 }
-
-.ivu-select-dropdown {
-  z-index: 1100 !important;
-}
 .auto-resize {
   table {
     table-layout: auto !important;