Bug 1451263: The 'add institution' button not sitting next to edit button

There is a gap between them and the should touch like other button
groups

behatnotneeded

Change-Id: Ie9b2843f87d76277f6b1d4239e2fb34f5cfdaede
Signed-off-by: Robert Lyon <robertl@catalyst.net.nz>

htdocs/theme/raw/sass/components/_btn-group.scss

@@ -50,6 +50,10 @@
     margin-left: -1px;
 }
 
+.form-as-button.btn-first {
+    margin-right: -1px;
+}
+
 .group-item,
 .btn-group-item {
     &.btn,

htdocs/theme/raw/templates/admin/users/institutions.tpl

@@ -42,7 +42,7 @@
 
     <div class="btn-group btn-group-top{if $siteadmin && $countinstitutions == 1} only-button{/if}">
         {if $siteadmin}
-        <form class="form-as-button pull-left" action="" method="post">
+        <form class="form-as-button pull-left btn-first" action="" method="post">
             <button class="submit btn btn-default" type="submit" name="add" value="{str tag="addinstitution" section="admin"}" id="admininstitution_add">
                 <span class="icon icon-plus icon-lg left" role="presentation" aria-hidden="true"></span>
                 <span class="btn-title">{str tag="addinstitution" section="admin"}</span>