Trivial fix to remove the obsolete `.hgtags` file from the repo. As mentioned in JBS, this file has (intentionally) not been updated since the switch to git. It will continue to be available in the `jfx17` branch [here](https://github.com/openjdk/jfx/blob/jfx17/.hgtags). The corresponding file was recently removed from the `jdk` repo.
------------- Commit messages: - 8278494: Remove .hgtags Changes: https://git.openjdk.java.net/jfx/pull/691/files Webrev: https://webrevs.openjdk.java.net/?repo=jfx&pr=691&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8278494 Stats: 544 lines in 1 file changed: 0 ins; 544 del; 0 mod Patch: https://git.openjdk.java.net/jfx/pull/691.diff Fetch: git fetch https://git.openjdk.java.net/jfx pull/691/head:pull/691 PR: https://git.openjdk.java.net/jfx/pull/691
