wgCopyUploadsDomains configuration for Wikimedia Commons

- wikimapia.org → photos.wikimapia.org
- improving comment

This is a followup of change I18d81c01b7da71e70ba5e38a95e26ef6620e518b.

Bug: 73045
Change-Id: I63a2c8871aeaa8f3f2046d12b0af5337b6479941