Feat: Option to add disliked videos to blocklist (closes #3269)

[pecazeco]

What:

• New option: blocklist_dislike_trigger (Blocklist section).
• When ON: When the user dislikes a video, it is automatically added to the blocklist.
• When OFF: Dislike a video doesn't affect the blocklist

Why:

• Requested in Block disliked videos #3269
• It seems natural that some users prefer to avoid videos that were disliked

How to test:

1. Dislike any video and check if it doesn't appear in the blocklist
2. Now, go to blocklist section and enable "Disliking a video adds it to Blocklist"
3. Try to dislike the video again and check if it now appears on the blocklist
4. Uncheck the dislike button and check if the video was removed from the list

Notes:

• If the video was added to the blocklist by the standard blocking button, liking or disliking it won't remove it from the blocklist (the only way is to remove manually from the blocklist)
• If the video was added to the blocklist by disliking it, unchecking the dislike button will remove it from the blocklist. This was designed for the user who clicked by accident can quickly undo this action

[ImprovedTube]

thank you so much! @pecazeco if (this.storage.blocklist_dislike_trigger) can be tested without declaring it.
removing if (typeof this.storage.blocklist_dislike_trigger === 'undefined') {this.storage.blocklist_dislike_trigger = false;}