osxvideo: fix avfoundation device name

Fixes a bug introduced in "osxvideo: use avfoundation indev" where the
video device didn't have the right name.

Change-Id: Ib2b31191925e89b6478a61812667ed5f86acc5d2
Reviewed-by: Kateryna Kostiuk <kateryna.kostiuk@savoirfairelinux.com>

src/media/video/osxvideo/video_device_impl.mm

@@ -96,7 +96,7 @@ VideoDeviceImpl::getDeviceParams() const
 {
     DeviceParams params;
     params.name = [[avDevice_ localizedName] UTF8String];
-    params.input = device;
+    params.input = params.name;
     params.format = "avfoundation";
 
     params.width = current_size_.first;