HPCC-11122 Alt tag causes missing image to display "Active"

Remove alt tag on ActiveImg so that alt tag text does not show if query is not active.

Signed-off by Miguel Vazquez <miguel.vazquez@lexisnexis.com>
Merge pull request #5628 from miguelvazq/HPCC-11122

HPCC-11122 Alt tag causes missing image to display "Active"

Reviewed-By: Gordon Smith <gordon.smith@lexisnexis.com>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>