Refactor. Move showNoCamera into mainQueue

[onmyway133]

Problem

• Open ImagePicker
• Deny access 😆
• Crash "This application is not allowed to access Photo data."

Then, we should

• Use weak inside block
• Move to main thread, this seems to get rid of Dangerous warning  #126

[aashishdhawan]

@onmyway133 I generally see overuse of self in hyperoslo's projects. Feels like ObjC-ish

this is sufficient i think

func handlePermission(granted: Bool, device: AVCaptureDevice) {
    if granted {
      captureDevice = device
      capturedDevices?.addObject(device)
    }

    dispatch_async(dispatch_get_main_queue()) {
      self.showNoCamera(!granted)
    }
  }

[RamonGilabert]

We actually tend to not use self, or try not to! But nice catch! :)

[onmyway133]

@aashishdhawan @RamonGilabert fixed ☺️