Call loadFromRow() as needed in Title::moveToInternal.
* Follows up
61c0064de538c3b1ea61470eadd88fab87d3513e,
which was missing a load call to fully fix the bug.
Calling loadFromRow() forced the page to load as
non-existing (which it should be).
* The redirect title was triggering a load from a slave in
updateRevisionOn() and wrongly updating the destination page
to point to the redirect revision and leaving the redirect
page with page_latest=0;
Bug : 46397
Change-Id: Id6abe062a0266a790716df8c592911fd89b83223