fix apex resolution to allow for relative helper/util methods

[lukethacoder]

Describe the bug
A clear and concise description of what the bug is.

To Reproduce

1. configure ./__mocks__/@salesforce/apex/MyTestController.js
2. create ./__mocks__/@salesforce/apex/utils.js
3. Import method from utils.js inside MyTestController.js

Expected behavior
Method should be imported correctly

Instead returns an error:

@salesforce_apex_MyTestController_getAccountById_utils.js:7 Uncaught (in promise) SyntaxError: Unexpected identifier '#utils'

Additional context
Add any other context about the problem here.