components(DarkThemeToggle): fix custom icon types

[SutuSebastian]

• [x] I have followed the Your First Code Contribution section of the Contributing guide

Changes

• [x] fixed DarkThemeToggle component custom icons iconDark and iconLight types

Issue

1143

Result

Before

After

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Name	Status	Preview	Comments	Updated (UTC)
flowbite-react	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 23, 2023 11:48am

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (7461173) 99.54% compared to head (bec54ce) 93.60%. Report is 159 commits behind head on main.

:exclamation: Current head bec54ce differs from pull request most recent head d76cb16. Consider uploading reports for the commit d76cb16 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1144 +/- ## ========================================== - Coverage 99.54% 93.60% -5.95% ========================================== Files 163 213 +50 Lines 6621 9049 +2428 Branches 401 483 +82 ========================================== + Hits 6591 8470 +1879 - Misses 30 579 +549 ```

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