HPCC-10964 List Selections via Keyboard Ignored

On the graph page, selecting items in the various lists with the mouse works fine, but selecting them via the keyboard would not register.

Fixes HPCC-10964

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>
Merge pull request #5668 from GordonSmith/HPCC-10964

HPCC-10964 List Selections via Keyboard Ignored

Reviewed-By: Miguel Vazquez <miguel.vazquez@lexisnexis.com>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>