decklink: Add missing newlines at the end of files

plugins/decklink/util.cpp

@@ -40,4 +40,4 @@ const char *bmd_audio_connection_to_name(BMDAudioConnection connection)
 	default:
 		return "Unknown";
 	}
-}
+}

plugins/decklink/util.hpp

@@ -4,4 +4,4 @@
 
 const char *bmd_video_connection_to_name(BMDVideoConnection connection);
 
-const char *bmd_audio_connection_to_name(BMDAudioConnection connection);
+const char *bmd_audio_connection_to_name(BMDAudioConnection connection);