chore(helper-line): rename incorrectly named test file

[adrianschmidt]

E2EPage etc can only be used in e2e-tests. This didn't cause trouble as long as all the tests where run, but this file caused npm run test:spec to error out, because the tests are actually e2e-tests, and can't run when the e2e-stuff isn't loaded.

Review:

• [ ] Commits are atomic
• [ ] Commits have the correct type for the changes made
• [ ] Commits with breaking changes are marked as such

Browsers tested:

(Check any that applies, it's ok to leave boxes unchecked if testing something didn't seem relevant.)

Windows:

• [ ] Chrome
• [ ] Edge
• [ ] Firefox

Linux:

• [ ] Chrome
• [ ] Firefox

macOS:

• [ ] Chrome
• [ ] Firefox
• [ ] Safari

Mobile:

• [ ] Chrome on Android
• [ ] iOS

[github-actions[bot]]

Documentation has been published to https://lundalogik.github.io/lime-elements/versions/PR-2910/

[lime-opensource]

:tada: This PR is included in version 37.17.2 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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