afilter/discard: Remove config includes

src/audio/filter/discard.cpp

@@ -35,14 +35,7 @@
  * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#include "config_unix.h"
-#include "config_win32.h"
-#endif /* HAVE_CONFIG_H */
-
 #include <memory>
-#include <string_view>
 
 #include "debug.h"
 #include "module.h"