Update OsmAnd/assets/voice/pl-tts/ttsconfig.p

After some testing there must be a comma before exit number from a roundabout and a comma before "next". TTS has to take a breath in these sentences. Also I made some corrections to roundabouts.
Merge pull request #393 from Debeet/patch-1

Update OsmAnd/assets/voice/pl-tts/ttsconfig.p