Remove QUnit option for `raiseonunhandleddeprecation`.

This is now required to pass Travis runs so it should just be enabled
all the time internally.  It has been a point of confusion for some
contributors (why do the tests pass locally but not on Travis).
Merge pull request #9521 from rwjblue/remove-checkbox-for-raise-unhandled-deprecation

Remove QUnit option for `raiseonunhandleddeprecation`.