fixed BS3 json-editor form-group

Author: schmunk42

src/assets/backend/less/json-editor.less

@@ -1,3 +1,10 @@
+// json-editor well padding
 .well-small {
   .well-sm;
-}
+}
+
+// json-editor Bootstrap 3 fix
+div[id$="-container"] div[data-schemaid] .form-group {
+  margin-right: 0px;
+  margin-left: 0px;
+}