[EGD-5973] Reduce audio stack usage

Verify stack usage of:
 - ServiceAudio
 - application music player
 - decoder worker
Change if possible to a realistic value keeping a 30% margin.
Stack usage reduction is limited due to an extensive stack usage of
every call to the filesystem, which uses around 2 kB of stack.

Signed-off-by: Marcin Smoczyński <smoczynski.marcin@gmail.com>

module-audio/Audio/decoder/DecoderWorker.cpp

@@ -5,7 +5,7 @@
 #include "Audio/decoder/Decoder.hpp"
 
 audio::DecoderWorker::DecoderWorker(Stream *audioStreamOut, Decoder *decoder, EndOfFileCallback endOfFileCallback)
-    : sys::Worker(DecoderWorker::workerName, DecoderWorker::workerPriority), audioStreamOut(audioStreamOut),
+    : sys::Worker(DecoderWorker::workerName, DecoderWorker::workerPriority, stackDepth), audioStreamOut(audioStreamOut),
       decoder(decoder), endOfFileCallback(endOfFileCallback),
       bufferSize(audioStreamOut->getBlockSize() / sizeof(BufferInternalType))
 {}