Always start audio from zero angle

Merged from ^/branches/wsjtx-1.6.



git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6252 ab8295b8-cf94-4d9e-aec4-7959e3be5d79

Modulator.cpp

@@ -61,6 +61,7 @@ void Modulator::start (unsigned symbolsLength, double framesPerSymbol,
   m_symbolsLength = symbolsLength;
   m_isym0 = std::numeric_limits<unsigned>::max (); // big number
   m_frequency0 = 0.;
+  m_phi = 0.;
   m_addNoise = dBSNR < 0.;
   m_nsps = framesPerSymbol;
   m_frequency = frequency;