Update Skia expectations in multiple corpus directories

Update Skia expectations in fx/font, fx/mulobj/new/signature/ and
fx/text.

Change-Id: Ic975f5cdb77a64fe9907ca0c9f967e32903e68cb
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium_tests/+/102496
Reviewed-by: K. Moon <kmoon@chromium.org>