Fix left margin of the gist list in the header

Author: takezoe

Diff for: src/main/twirl/gitbucket/gist/edit.scala.html

@@ -8,7 +8,7 @@
     <div id="error"></div>
     @if(gist.isEmpty){
       <div>
-        <ul style="list-style: none; margin-left: 0px;">
+        <ul style="list-style: none; margin-left: 0px; padding-left: 0px;">
         @recent.map { gist =>
           <li style="float: left; width: 200px;">
             <i class="octicon octicon-gist" style="width: 24px; height: 24px;"></i>