HPCC-12113 Heat Map does not refresh with timers

Fixes HPCC-12113

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>
Merge pull request #6364 from GordonSmith/HPCC-12113

HPCC-12113 Heat Map does not refresh with timers

Reviewed-By: Miguel Vazquez <miguel.vazquez@lexisnexis.com>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>