[editor] Fix explain panel scrolling in editor v2
<!-- ko if: explanation -->
<div class="tab-pane" id="queryExplain" data-bind="css: {'active': currentQueryTab() == 'queryExplain'}">
<div class="editor-bottom-tab-panel">
+ <div style="width: 100%; height: 100%; overflow-y: auto;">
<pre class="no-margin-bottom" data-bind="text: explanation"></pre>
</div>
</div>
+ </div>
<!-- /ko -->
<!-- ko if: HAS_WORKLOAD_ANALYTICS && dialect() === 'impala' -->
