rm unused fct

Device/Resolution/Convolve.h

@@ -65,9 +65,6 @@ public:
     //! prepare arrays for 2D convolution of given vectors
     void init(int h_src, int w_src, int h_kernel, int w_kernel);
 
-    //! Sets convolution mode
-    void setMode(ConvolutionMode mode) { m_mode = mode; }
-
 private:
     //! compute circual convolution of source and kernel using fast Fourier transformation
     void fftw_circular_convolution(const double2d_t& src, const double2d_t& kernel);