feat: YouTube: Hide Search Bar Cast Button

[Immortalin]

Feature description

There is a cast button next to the search bar which currently does not have the option to be hidden

Motivation

There is a hide cast button feature for the player, allowing hiding in the search bar would provide parity to the other feature.

Acknowledgements

• [X] I have checked all open and closed feature requests and this is not a duplicate
• [X] I have chosen an appropriate title.
• [ ] All requested information has been provided properly.

[oSumAtrIX]

I don't see any cast button next to the search bar

[Immortalin]

It's the video camera icon