Bulk edit request: remove Google Plus links.

Motivation: Google Plus is retired, and all links are now broken.

Request: someone with enough energy to deal with bulk edits paperwork, please consider deleting all links mentioning Google plus.

OverPass Query:

Support in principle: however, https://wiki.openstreetmap.org/wiki/Key:contact:google_plus will need to be updated to reflect the closure of Google Plus for general use.