Fix: Allow injecting into iFrame embeds

[Squidkingdom]

Proposed changes

Enable injecting into embedded versions of twitch chats with a small manifest change.

Change to ReplyTray.vue fixes an issue where replying to an embedded chat scrolls the entire page down.

Types of changes

What types of changes does your code introduce to 7TV?

• [ x/2] Bugfix (non-breaking change which fixes an issue)
• [x/2 ] New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)

Checklist

You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your code._

• I have read the CONTRIBUTING doc
• I have added necessary documentation (if appropriate)
• Any dependent changes have been merged