[voicecall] Use 16-bit samples for voicecall recording. Contributes t…

…o MER#1547

plugins/declarative/src/voicecallaudiorecorder.cpp

@@ -14,7 +14,7 @@ const QString recordingsDir("CallRecordings");
 
 const quint16 ChannelCount = 1;
 const quint16 SampleRate = 8000;
-const quint16 SampleBits = 8;
+const quint16 SampleBits = 16;
 const quint32 WaveHeaderLength = 44;
 const quint16 WavePCMFormat = 1;