decklink: Fix FC<->LFE channel swap for some devices

Fixes mantis issue https://obsproject.com/mantis/view.php?id=1379
For some devices with hdmi input, the Front Center channel and the LFE
channel are swapped. For some others they are not.
To solve the issue a new swap setting is added so that the user can
swap the two channels if needed.

plugins/decklink/DecklinkInput.cpp

@@ -1,4 +1,4 @@
-#include "DecklinkInput.hpp"
+#include "DecklinkInput.hpp"
 
 #include <util/threading.h>
 
@@ -61,7 +61,8 @@ bool DeckLinkInput::Activate(DeckLinkDevice *device, long long modeId)
 		    instance->GetActivePixelFormat() == pixelFormat &&
 		    instance->GetActiveColorSpace() == colorSpace &&
 		    instance->GetActiveColorRange() == colorRange &&
-		    instance->GetActiveChannelFormat() == channelFormat)
+		    instance->GetActiveChannelFormat() == channelFormat &&
+		    instance->GetActiveSwapState() == swap)
 			return false;
 	}