Update registration forms to use new styles

h/static/styles/forms.scss

@@ -83,9 +83,12 @@
 }
 
 .form-error-list {
+  margin-top: 5px;
+}
+
+.form-error {
   font-size: 13px;
   line-height: 1.5;
-  margin-top: 5px;
   color: #b4777a;
 }