RepoEditor: Improve tab spacing and styling.

app/assets/stylesheets/pages/repo.scss

@@ -156,7 +156,7 @@
         list-style-type: none;
         background: $gray-normal;
         display: inline-block;
-        padding: 10px 18px;
+        padding: #{$gl-padding / 2} $gl-padding;
         border-right: 1px solid $white-dark;
         border-bottom: 1px solid $white-dark;
         white-space: nowrap;
@@ -180,10 +180,9 @@
         a {
           @include str-truncated(100px);
           color: $black;
-          width: 100px;
-          text-align: center;
           vertical-align: middle;
           text-decoration: none;
+          margin-right: 12px;
 
           &.close {
             width: auto;