.hgtags: remove accidental unused double tag of 0.4.0rc1

Initially, when tagging 0.4.0rc1 I made a mistake locally, fixed it, then
stripped the tagging commit, and retagged.
However, it seems something went wrong in this procedure and the original
commit also is shown in .hgtags.

This commit never got pushed, is hidden (obsolete) in my local repository,
so remove the corresponding line in .hgtags to avoid any confusion.

Added tag 0.3.3 for changeset 64ea7ea09236
Added signature for changeset 64ea7ea09236

Added tag 0.3.2 for changeset a84d40e9481f
Added signature for changeset a84d40e9481f

Added tag 0.3.1 for changeset 9bf8eb837e78
Added signature for changeset 9bf8eb837e78

Added tag 0.3 for changeset 9b3e9e242f5c
Added signature for changeset 9b3e9e242f5c