Remove sync server-type from chrome_test_server_spawner.py

The sync test server was deleted in 088b19ea.

Bug: 406545
Change-Id: I403d50812b4b1d6c97579fc46ae85ca4495fabcd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1612761
Commit-Queue: Eric Roman <eroman@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#660105}
1 file changed