Go To page number not cleared on close of current

The 9.9.0 release appears to have stopped the GoTo page number field being cleared when the file and/or app is closed, even when opening a different file. Unsure whether the fix below has caused this issue (or maybe it's intended?)

GoTo page: Fix segfault when entering page numbers greater than comic's page count (toolbar and page flow)

If the app is closed the number is cleared, but not after closing the dialog, this is a bug.