Updated gogs.css - monospace font for hash

Updated gogs.css to use monospaced font for sha hash label in repository view to make it look nicer because of equal label width.

public/ng/less/gogs/repository.less

@@ -247,6 +247,9 @@
 }
 #repo-files-table {
     margin-bottom: 20px;
+    .sha .label {
+     font-family: Monaco,Menlo,Consolas,"Courier New",monospace;   
+    }
     th, td {
         text-align: left;
         line-height: 32px;