fix(pt/Anitube): Added option to disable File4Go mirror

[WebDitto]

Sometimes, the file4go have a strong cloudflare protection.

With disabled option, the fetch videos vill be faster.

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
• Have made sure all the icons are in png format