[Bug]: Theme icon is a little buggy on page load.

[LagunaElectric]

Describe the bug
Sometimes the theme button doesn't do anything the first time you click it after loading the page.

To Reproduce
Steps to reproduce the behavior:

1. Load the page
2. Click on the theme switch button.
3. Potentially observe that mostly nothing happens. Notably the theme doesn't change until you click it again.

Expected behavior
The icon should reflect the current theme, and the theme should switch when the button is clicked.