HPCC-9221 Deleting package from roxie will cause query to hang

Remove the critsec that is not needed and causes deadlocks.

The deadlock was a regression in 4.0.0, release candidates 5 and lower.
The issue was revealed by recent changes to package reload code,
and does not affect any released version.

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>