[PWA] Only enable link capturing for supported display modes

This change is a much more thorough guarantee that unsupported display
modes will never hit our navigation capturing logic until we are ready
to support them.

R=mek@chromium.org

Change-Id: I4fdaa864c52f82344adbaa9b988f551942cca6e7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5976743
Commit-Queue: Daniel Murphy <dmurph@chromium.org>
Reviewed-by: Finnur Thorarinsson <finnur@chromium.org>
Auto-Submit: Daniel Murphy <dmurph@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1375913}