Update StoriesRole enum

[RichDom2185]

Description

Updates the frontend enum values (and help messages) following the corresponding backend change in source-academy/stories-backend#63.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Code quality improvements

Checklist

• I have tested this code
• I have updated the documentation

[coveralls]

Pull Request Test Coverage Report for Build 5756004610

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 37.454%

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Totals
Change from base Build 5727812224:	0.0%
Covered Lines:	5732
Relevant Lines:	14377

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💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 5756004610

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 37.454%

---

Totals
Change from base Build 5727812224:	0.0%
Covered Lines:	5732
Relevant Lines:	14377

---

💛 - Coveralls