don't force mono to false, fixing some brsar songs that used to crash

Author: khang06

src/main/DLSFile.cpp

@@ -487,7 +487,7 @@ void DLSWave::WriteSample(vector<uint8_t> &buf, bool mono) {
 }
 
 void DLSWave::Write(vector<uint8_t> &buf, bool mono) {
-  mono = false;
+  //mono = false;
   uint32_t theDWORD;
   uint16_t numChannels = mono ? 1 : wChannels;
 
@@ -513,4 +513,4 @@ void DLSWave::Write(vector<uint8_t> &buf, bool mono) {
   PushTypeOnVectBE<uint32_t>(buf, 0x494E414D);            //"INAM"
   PushTypeOnVect<uint32_t>(buf, (uint32_t) name.size());  //size
   PushBackStringOnVector(buf, name);
-}
+}