Tidy up "diag_logs_filter_summary.php" XHTML

Remove "px" from width statement, not valid in XHTML
Add SUMMARY to table statements
Add ALT and close img statements
Add CDATA to script statements
Add secondary TAB row for "filter" and "dynamic" logs
Add closing BODY and HTML statements
Merge pull request #831 from ExolonDX/branch_06

Tidy up "diag_logs_filter_summary.php" XHTML