Offer the typed text as a link suggestion if the page is valid

Currently we only offer the normalised page title from the server
so 'iPhone' only suggests 'IPhone'. With this fix we offer the typed
text as the first suggestion if it matches via mw.Title, so 'iPhone'
suggests ['iPhone', 'IPhone', ...]

Bug: 50452
Change-Id: I05cc0cd19537cbfa682d7aac0f9640decea282b5
Merge "Offer the typed text as a link suggestion if the page is valid"