Copy the labels only if the target board is different
Copy the labels only if the target board is different

This fixes the issues https://github.com/wekan/wekan/issues/2404 and
https://github.com/wekan/wekan/issues/2970 if the target board doesn't differ
from the source board.

wekan/wekan,wekan/wekan,wekan/wekan,wekan/wekan,wekan/wekan