bug(developer): Hint_ScriptDoesNotMatch is confused when full tag not found in langtags.json

[mcdurdin]

Even so, with the explicit subtag, the script should have always been java. I need to check to make sure there isn't a logic bug in the compiler!

And ... there it is. If the tag as given in the package isn't found in langtags.json, e.g. in this case, id-Jawa, then the compiler gets confused and uses instead the default script subtag. Will resolve this, and re-report just to make sure we are not adding extra confusion to the mix.

Originally posted by @mcdurdin in keymanapp/keyboards#3234 (comment)

Arising-from: #12753