02_repeatString/solution/repeatString-solution.spec.js: Fix typo

[kennotfindsymbol]

Because there is a typo on line 31 of 02_repeatString/solution/repeatString-solution.spec.js

This PR fixes the typo

Issue

• Should be 'randomly' instead of 'randomaly' on line 31

Closes #XXXXX

Additional Information

Pull Request Requirements

• I have thoroughly read and understand The Odin Project Contributing Guide
• The title of this PR follows the location of change: brief description of change format, e.g. 01_helloWorld: Update test cases
• The Because section summarizes the reason for this PR
• The This PR section has a bullet point list describing the changes in this PR
• If this PR addresses an open issue, it is linked in the Issue section
• If this PR includes any changes that affect the solution of an exercise, I've also updated the solution in the /solutions folder