Fix typo: change '1 times' to '1 time' in repeatString test

[Shresth2725]

Because

The test description in repeatString.spec.js had a grammatical typo — it said "1 times" instead of the correct singular "1 time". This can cause confusion and reduces clarity in the tests.

This PR

• Fixes the typo in the test description on line 10 of repeatString.spec.js.
• Changes the string from 'repeats the string 1 times' to 'repeats the string 1 time'.

Issue

Closes #546

Additional Information

This is my first open source contribution, happy to learn and improve!

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. 06_repeatString: Fix test description typo
• 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 (if applicable)

[Shresth2725]

Hi! Just wanted to check if there’s anything else needed from my side to get this PR merged. Thanks!