Endless loop when setting endVideoBehavior

[martindaum]

The properties endVideoBehaviorString and endVideoBehavior mutally set each other, creating an endless lopp.

/// What do do when the video ends (default: PauseOnLastFrame) as a String
    public var endVideoBehaviorString: String = "pause" {
        didSet {
            self.endVideoBehavior = WistiaEndVideoBehavior.fromString(self.endVideoBehaviorString)
        }
    }
    
    /// What do do when the video ends (default: PauseOnLastFrame) as a String
    public var endVideoBehavior: WistiaEndVideoBehavior = .pauseOnLastFrame {
        didSet {
            self.endVideoBehaviorString = endVideoBehavior.description()
        }
    }