Fixed generation params in gallery

[liamkerr]

Describe what this pull request is trying to achieve. This PR fixes a small but annoying bug: after using the fullscreen modal to view images in the gallery, the generation params beneath the image fail to update properly. This bug was caused by a change to the style class of the selected tab.

Environment this was tested in

List the environment you have developed / tested this on. As per the contributing page, changes should be able to work on Windows out of the box.

• OS: Windows
• Browser: firefox
• Graphics card: NVIDIA RTX 4070 Ti

Screenshots or videos of your changes Here's a video of the bug - starting from the first image ("Seed: 1"), I open the modal, move to the right twice, then close the modal. Beneath the image, it displays "Seed: 2", instead of the expected "Seed: 3". After I click the thumbnail, the UI correctly updates to show "Seed: 3":

https://user-images.githubusercontent.com/8740062/231605434-872bc76c-2c2e-4259-a69b-202ed25b1d98.mp4

Here's a video of my fix - after following the same steps as above, you can see that after closing the modal, it correctly displays "Seed: 3" beneath the image:

https://user-images.githubusercontent.com/8740062/231606835-b6c19999-38e5-441d-92bb-6d9412b8ef0a.mp4

[Sakura-Luna]

I don't know how long it will be before someone fixes the broken "Preview tiling" button.

[missionfloyd]

@Sakura-Luna It works here.

[Sakura-Luna]

It works here.

Strange, it worked when I checked it again and I think I'll keep watching it.