Fix copy hours function
Superseeds https://framagit.org/framasoft/framadate/merge_requests/206
Closes https://framagit.org/framasoft/framadate/issues/203
All credit due to @TDavid
Superseeds https://framagit.org/framasoft/framadate/merge_requests/206
Closes https://framagit.org/framasoft/framadate/issues/203
All credit due to @TDavid