Unify the multiple dialogs for webcam settings into a single dialog

[ffdixon]

Describe the bug Simplify the video settings dialogs into a single dialog.

To Reproduce Share a webcam in BigBlueButton 2.7 and there are two choices for modifying the webcam settings: Open advanced settings and Visual effects

Both of these seem to be similar, but different

Visual effects shows options for changing the background and brightness

where Webcam settings includes the Visual effects choices with multiple buttons to stop sharing video.

Expected behavior A single dialog that lets you update webcam settings.

Actual behavior Multiple dialogs that are not clear to the user the differences.

BBB version: 2.7.4