🐞"Disable auto dubbing" option doesn't work when defaultDubbedLanguage is set

Description:
When "Disable auto dubbing" and "Hide auto-dubbed options in menu" are both enabled, and a language is selected in defaultDubbedLanguage, YouTube still plays auto-dubbed audio. The "Disable auto dubbing" feature is being ignored.

Steps to reproduce:

1. Enable Disable auto dubbing
2. Enable Hide auto-dubbed options in menu
3. Set a language in defaultDubbedLanguage
4. Open a video that has auto-dubbing available
5. Play the video

Expected behavior:
When "Disable auto dubbing" is enabled, auto-dubbed tracks must be completely avoided.
ImprovedTube should first try to use the language from defaultDubbedLanguage (if a real dub for this language exists in the video).
If the selected language is not available, it should fall back to the original audio track.

Environment:

• ImprovedTube version: from source
• Browser: Helium
• OS: Windows 11

Additional context:
This started after updating ImprovedTube from source.

ImprovedTube settings:
improvedtube.json

YouTube root element:
youtube root element.txt

No source file or test entry point is named in the issue. First reproduce the behavior with Disable auto dubbing, Hide auto-dubbed options in menu, and defaultDubbedLanguage enabled, then trace the playback handling for those settings. Done means a real selected-language dub is used when available, otherwise the original audio track is selected and auto-dubbed audio is avoided.