Make branch icon stand out more

- Currently the branch icon is "squashed" between the two branch names
and feels a bit "amateur-ish" to my feeling(relative to other UI
elements).
- This patch tries to improve that by making the icon bigger
and by adding some margin to not have a "squashed" icon.
- This patch also includes a "fix", for some reason this symbol is not
centering correctly within the span(or without for that matter), so
simply manually patch this by adding `bottom: 1.px`.

Author: Gusted

templates/shared/issuelist.tmpl

@@ -72,7 +72,7 @@
 								</a>
 							</div>
 
-							&laquo;
+							<span class="branch-icon">&laquo;</span>
 
 							{{if .PullRequest.HeadRepo}}
 							<div class="branch">

web_src/less/shared/issuelist.less

@@ -135,6 +135,13 @@
       text-overflow: ellipsis;
       max-width: 10em;
     }
+
+    .branch-icon {
+      bottom: 1.5px;
+      font-size: 22px;
+      margin: 0 .2em;
+      position: relative;
+    }
   }
 
   > .item + .item {