Use '#markup' not '#value' for markup

I'm attaching a patch that adds #markup to the "fapi_title" security check.

I haven't seen any indication that the checks are run differently between Drupal 6 and Drupal 7, so this patch might generate some false positives when scanning Drupal 6 code, but it definitely seems to be a beneficial check in the testing I've done so far with Drupal 7.

Coder 7.x-1.x is frozen now and will not receive any updates. Coder 8.x-2.x can be used to check code for any Drupal version, Coder 8.x-2.x also supports the phpcbf command to automatically fix conding standard errors. Please check if this issue is still relevant and reopen against that version if necessary.