[HaTS] Adjust kDidChoosePlusAddressOverEmail survey trigger condition.

After aligning with the UX team, it was decided that the
kDidChoosePlusAddressOverEmail survey should be triggered even if
the popup doesn't have other alternative email addresses offered.

Bug: 348139343
Change-Id: I06fe56856444cb126a67874ebff215035b66ef65
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6198873
Reviewed-by: Norge Vizcay <vizcay@google.com>
Code-Coverage: findit-for-me@appspot.gserviceaccount.com <findit-for-me@appspot.gserviceaccount.com>
Commit-Queue: Timofey Chudakov <tchudakov@google.com>
Cr-Commit-Position: refs/heads/main@{#1412257}