Fix setting form-check class

skins/elastic/styles/widgets/forms.less

@@ -326,7 +326,9 @@ html.layout-phone {
 
 td.editfield { width: 99%;  /* TODO */ }
 
-.form-group { margin-bottom: .5rem; /* overwrites Bootstrap style */ }
+.form-group {
+    margin-bottom: .5rem; /* overwrites Bootstrap style */
+}
 
 
 ul.proplist {

skins/elastic/ui.js

@@ -485,7 +485,7 @@ function rcube_elastic_ui()
                 first.addClass('col-sm-4');
                 last.addClass('col-sm-8');
 
-                if (last.find('[type=checkbox]').length) {
+                if (last.find('[type=checkbox]').length == 1) {
                     row_classes.push('form-check');
                 }
                 else if (!last.find('input,textarea,radio,select').length) {