Fixed an issue regarding reading campaign creation timestamps with masks.
Fixed an issue regarding reading campaign creation timestamps with masks.

Masks need to replace the campaign's creation timestamp with their own creation timestamp. This tells the phone when a mask has been updated.

Closes #522

hongsudt/server,HaiJiaoXinHeng/server-1,HaiJiaoXinHeng/server-1,hongsudt/server,hongsudt/server,HaiJiaoXinHeng/server-1