.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.

.hgtags

@@ -69,6 +69,5 b' cf635c823ea059cc3a1581b82d8672e46b682384'
 4cca4cc6a0a97f4c4763317184cd41aca4297630 0.3.5
 082c9b8f0f17bd34740eb90c69bdc4c80d4b5b31 0.3.6
 a18445b85d407294da0b7f1d8be3bedef5ffdea6 0.3.7
-43d472db8c82690ec36bdfc26a985eb0ff726788 0.4.0rc1
 8db761c407685e7b08b800c947890035b0d67025 0.4.0rc1
 60f726162fd6c515bd819feb423be73cad01d7d3 0.4.0rc2