[BNPL][Klarna] Increase pop up window height

This CL increases the height of the issuer redirect pop up for BNPL
flow, so that the Klarna ID verification page can be shown properly.

Screencast of different issuer flow (local build runs slower than
released version, please fast forward to check the different screens):
Affirm: http://screencast/cast/NTUzMzQxMTQ5MzAxOTY0OHwxN2M2ZTg2NS0zMw
Zip: http://screencast/cast/NDkwMDQ1MDUxOTIyMDIyNHw1OTM5ZjNlNS0yOQ
Klarna: http://screencast/cast/NDU1MTE4NjgzMjE2MjgxNnw5ZmU1Y2QwYS04Nw

Before:
https://screenshot.googleplex.com/6o4L3BsBWWDf68N.png
After:
https://screenshot.googleplex.com/BvZm3ZumtkFVVyb.png

Bug: b:439040297
Change-Id: Ib9028ed794e2b029521ed7fcfc9494b501274758
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6854403
Reviewed-by: Vinny Persky <vinnypersky@google.com>
Commit-Queue: Yishui Liu <yishuil@google.com>
Cr-Commit-Position: refs/heads/main@{#1502235}