DSD decoder: disable cosine filter

plugins/channel/demoddsd/dsddecoder.cpp

@@ -28,6 +28,7 @@ DSDDecoder::DSDDecoder()
     m_decoder.setDecodeMode(DSDcc::DSDDecoder::DSDDecodeAuto, true); // Initialize with auto-detect
     m_decoder.setUvQuality(3); // This is gr-dsd default
     m_decoder.setModulationOptimizations(DSDcc::DSDDecoder::DSDModulationOptimAuto); // Initialize with auto detection of modulation optimization:
+    m_decoder.enableCosineFiltering(false);
 }
 
 DSDDecoder::~DSDDecoder()