MT#56234 voip_preferences ringtimeout flag update

* ringtimeout is now internal = 1 as this preference is dynamically
  changed by CFT call forwards and is not meant to be usable from the
  UI/API

Change-Id: I6c2abf94e455cf50cdbc6cf7122844582ba6bbb4

db_scripts/diff/15747.down

@@ -0,0 +1,6 @@
+use provisioning;
+set autocommit=0;
+
+UPDATE voip_preferences SET internal = 0 WHERE attribute = 'ringtimeout';
+
+COMMIT;

db_scripts/diff/15747.up

@@ -0,0 +1,6 @@
+use provisioning;
+set autocommit=0;
+
+UPDATE voip_preferences SET internal = 1 WHERE attribute = 'ringtimeout';
+
+COMMIT;