Request - Allow changing default tab from Video

[neonpixella]

Pre-Request Checklist

• I have checked Playnite's settings (e.g., in Settings -> Appearance) and confirmed that this change cannot be made there.
• I have checked that this feature is not already available using the ThemeModifier plugin.

Feature Description

I had asked in the Playnite discord about allowing Steam Screenshots Viewer to load by default on launch, and you mentioned that the theme selects the Video tab by default (which I had none downloaded, so the tab didn't appear at all) and suggested opening an issue.

Currently, Steam Screenshots Viewer is closed by default due to the default tab behavior and I have to manually open it to get any to load. It'd be nice if I could make it the defaulttab in the theme.

Screenshots or Mockups

No response