Call `done.fail` correctly in the `scripting_spec.js` unit-tests
Call `done.fail` correctly in the `scripting_spec.js` unit-tests

The `done.fail` method should *always* be called with a reason, to ensure that any errors are propagated as intended to the test results.

timvandermeij/pdf.js,nawawi/pdf.js,showpad/mozilla-pdf.js,Shoobx/pdf.js,xavier114fch/pdf.js,showpad/mozilla-pdf.js,timvandermeij/pdf.js,macroplant/pdf.js,mozilla/pdf.js,Shoobx/pdf.js,Snuffleupagus/pdf.js,Shoobx/pdf.js,caremerge/pdf.js,timvandermeij/pdf.js,macroplant/pdf.js,mozilla/pdf.js,Snuffleupagus/pdf.js,caremerge/pdf.js,Snuffleupagus/pdf.js,mozilla/pdf.js,nawawi/pdf.js,macroplant/pdf.js,xavier114fch/pdf.js,nawawi/pdf.js,showpad/mozilla-pdf.js