HPCC-10966 About window does not update the Graph Viewer version after install

Fixes HPCC-10966

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>
Merge pull request #5483 from GordonSmith/HPCC-10966

HPCC-10966 About window does not update the Graph Viewer version after i...

Reviewed-By: Miguel Vazquez <miguel.vazquez@lexisnexis.com>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>