Drop Trigger IF Exists fatals if custom table too long

I fixed some tests that were failing by reducing the length of the custom group title when creating custom groups (via api) - however, I don't think there is something to prevent this occurring in the wild.

Basically the trigger is called civicrm_value_title_on_insert & there is a length limit on the trigger (I read 18 but that doesn't make sense as I haven't hit it in the wild. Anyway, when you go to delete the custom group now there is a 'delete trigger if exists' (even without logging on) & it was fataling everytime on the tests until I imposed a length limit