Fix content disapearing in demo when remote video is enabled

[hensmi-amazon]

Issue #: None

Description of changes: Previous any new remote videos would cause local content to be filtered out. This fixes that.

Testing: See steps below.

Can these tested using a demo application? Please provide reproducible step-by-step instructions.

1. Enable video and content on one attendee
2. Enable video on the second and look at the first. You should see 3 total displayed videos.

Checklist:

1. Have you successfully run npm run build:release locally? y

2. Do you add, modify, or delete public API definitions? If yes, has that been reviewed and approved? n

3. Do you change the wire protocol, e.g. the request method? If yes, has that been reviewed and approved? n

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.