HPCC-12295 Packagemap validate should ignore ~~ on file names

Signed-off-by: Anthony Fishbeck <anthony.fishbeck@lexisnexis.com>
Merge pull request #6478 from afishbeck/packageValidate2tilda

HPCC-12295 Packagemap validate should ignore ~~ on file names

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>