Update meta redirect to link directly to index.php

[ramsey]

When I committed 5cdd1dd, the web server appeared to prefer loading the index.php file over index.html when requesting /license/ZendGrant/. I left index.html in place because there were direct links to it from around the web, and I didn't want those links to end at 404 pages, so I set it up to redirect to the cleaner /license/ZendGrant/ URL, thinking index.php would load every time.

Now, the web server appears to prefer index.html over index.php, so landing on this page, either from /license/ZendGrant/ or /license/ZendGrant/index.html results in an endless redirection loop. The easy solution is to make index.html redirect directly to /license/ZendGrant/index.php instead.