TextLayout|View: Add missing (inout)s on TextIters

The lack of an annotation in such cases means Vala assumes it can pass
the TextIter by value, but these methods need to update the iter, so we
need Vala to pass by reference. Adding (inout) allows that to happen.

1 job for 78-textview-forward_display_line-doesn-t-work in 8 minutes and 2 seconds (queued for 5 seconds)
Status Job ID Name Coverage
passed build #14266