[UK] Re-include Bristol in open311-populate-service-list

Bristol's Open311 endpoint still seems to be returning empty metadata
for some services that claim to have metadata. They have made changes to
their published services since the change was made to exclude their
endpoint, which is causing issues for new reports.

Rather than exclude their endpoint entirely from being updated, this
commit just silences the noisy error message for Bristol.

Reverts the change made in 491eb26e4.

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