HPCC-9113 Running workunit not refreshing tabs

Initial "monitor" callback does not happen until next change.

Fixes HPCC-9113

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>
Merge pull request #4220 from GordonSmith/HPCC-9113

HPCC-9113 Running workunit not refreshing tabs

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>