sponsorblock: use serviceId instead of string comparison to determine…

[evermind-zz]

What is it?

• [ ] Bugfix (user facing)
• [ ] Feature (user facing)
• [x] Codebase improvement (dev facing)
• [ ] Meta improvement to the project (dev facing)

Description of the changes in your PR

• instead of using string to determine if the youtube service is used use the serviceId

APK testing

The APK can be found by going to the "Checks" tab below the title. On the left pane, click on "CI", scroll down to "artifacts" and click "app" to download the zip file which contains the debug APK of this PR.

Due diligence

• [x] I read the contribution guidelines.