Tidy up "services_captiveportal_zones.php" XHTML

Add SUMMARY to tables
Close IMG and add ALT
Close INPUT
Move NOWRAP to class
Deprecate ampersand
Swap BODY with php statement
Remove redundant closing TR and TABLE
Merge pull request #1046 from ExolonDX/branch_master_02

Tidy up "services_captiveportal_zones.php" XHTML