MadTheme: Enhance chapter parse

[dngonz]

Closes #3976

Now instead of just get chapters request by slug first try to get it by id.
Tested on all 14 extension that use it, but if someone found any other error please report.

Checklist:

• Updated extVersionCode value in build.gradle for individual extensions
• Updated overrideVersionCode or baseVersionCode as needed for all multisrc extensions
• Referenced all related issues in the PR body (e.g. "Closes #xyz")
• Added the isNsfw = true flag in build.gradle when appropriate
• Have not changed source names
• Have explicitly kept the id if a source's name or language were changed
• Have tested the modifications by compiling and running the extension through Android Studio
• Have removed web_hi_res_512.png when adding a new extension

[AwkwardPeak7]

you return this idFound in chapterListRequest everytime, so when would the later code be called/necessary?

edit: nvm i missread the code