qapi: Fix QAPISchemaEnumType.is_implicit() for 'QType'

Missed in commit 7264f5c5.  Harmless, because nothing checks whether an
enumeration type is implicit so far.
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>
Message-Id: <1489582656-31133-14-git-send-email-armbru@redhat.com>

scripts/qapi.py

@@ -1152,8 +1152,8 @@ class QAPISchemaEnumType(QAPISchemaType):
             v.check_clash(self.info, seen)
 
     def is_implicit(self):
-        # See QAPISchema._make_implicit_enum_type()
-        return self.name.endswith('Kind')
+        # See QAPISchema._make_implicit_enum_type() and ._def_predefineds()
+        return self.name.endswith('Kind') or self.name == 'QType'
 
     def c_type(self):
         return c_name(self.name)