*.epls: Replace explicit dashes with colons.

*.epls: Replace explicit dashes with colons.

This is the first stage in an effort to replace all of the dashes.  In
cases where there are multiple separators in a name, it would be nice to
have both kinds, but in fact there aren't any such cases, and we're not
limited to the characters that can be expressed through SMB, so use the
one that's prettier and easier to type.