Tidy up "firewall_shaper_layer7.php" XHTML

Add missing closing SPAN tag
Remove P tag and class from shaper message
Swap TABLE and DIV tags
Add CDATA sections to SCRIPT tags and escape closing SECTION and OPTION
tags
Add missing TR tag
Add missing end DIV tag
Merge pull request #511 from ExolonDX/branch_05

Tidy up "firewall_shaper_layer7.php" XHTML