remove group constrainte, it's now a normal group

tests/dictionaries_old/88valid_enum_not_number/00-base.xml

@@ -0,0 +1,21 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<rougail version="0.9">
+  <variables>
+    <family name="general" mode="expert">
+      <variable name="mode_conteneur_actif" type="string" description="No change">
+        <value>non</value>
+      </variable>
+    </family>
+    <family name="enumfam" mode="expert">
+      <variable name="enumvar" type="number" description="enumvar"/>
+    </family>
+  </variables>
+  <constraints>
+    <check name="valid_enum">
+      <param>a</param>
+      <param>b</param>
+      <param>c</param>
+      <target>enumvar</target>
+    </check>
+  </constraints>
+</rougail>