[Autofill Assistant] Fix double dividers in payment request.

This fixes a bug where the AA payment request would sometimes show two dividers between sections, resulting in a thicker divider than intended.

Before: https://screenshot.googleplex.com/WhYYQmeOTsX.png
After: https://screenshot.googleplex.com/noR3SYyy2ts.png

Bug: 806868
Change-Id: I94fc47d92c7f46a488d65c64f29e13e137b131d7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1619790
Reviewed-by: Jordan Demeulenaere <jdemeulenaere@chromium.org>
Commit-Queue: Clemens Arbesser <arbesser@google.com>
Cr-Commit-Position: refs/heads/master@{#661338}
1 file changed