[Chapel Merge] Add a missing "In module MMM:" note

Branch: refs/heads/master
Revision: d498294
Author: vasslitvinov
Log Message:

Merge pull request #17515 from vasslitvinov/fix--two-modules2-error

Add a missing "In module MMM:" note

I missed this test in #17483.

Trivial, not reviewed.

Modified Files:
M test/extern/ferguson/externblock/two-modules2-error.good

Compare: https://github.com/chapel-lang/chapel/compare/db190e9941c4...d4982943368a