decoder/Thread: reimplement HasRemoteTagScanner() using the InputPlugin list

src/decoder/Thread.cxx

@@ -28,6 +28,7 @@
 #include "DecoderAPI.hxx"
 #include "input/InputStream.hxx"
 #include "input/LocalOpen.hxx"
+#include "input/Registry.hxx"
 #include "DecoderList.hxx"
 #include "system/Error.hxx"
 #include "util/MimeType.hxx"
@@ -432,14 +433,6 @@ try {
 						  error_uri));
 }
 
-gcc_pure
-static bool
-HasRemoteTagScanner(const char *uri) noexcept
-{
-	return StringStartsWith(uri, "tidal://") ||
-		StringStartsWith(uri, "qobuz://");
-}
-
 /**
  * Try to guess whether tags attached to the given song are
  * "volatile", e.g. if they have been received by a live stream, but