Fix (add space between colon and values) log message for GWSkyNet
Closes #629 (closed). This merge request will add space in GWSkyNet log message so that the message would be:
GWSkyNet annotation from bayestar.multiorder.fits. GWSkyNet class score: 0.964, FAP: 0.096, FNP: 0.249. (gwskynet.json)
instead of
GWSkyNet annotation from bayestar.multiorder.fits. GWSkyNet class score: 0.964, FAP:0.096, FNP:0.249. (gwskynet.json)