ui: file headers should be flexible, to expand on long paths

rhodecode/public/css/summary.less

@@ -255,7 +255,6 b''
 
     .stats {
         float: left;
-        width: 50%;
     }
     .stats-filename {
         font-size: 120%;
@@ -266,7 +265,6 b''
 
     .buttons {
         float: right;
-        width: 50%;
         text-align: right;
         color: @grey4;
     }