Reset prompt buffer position to zero once VP had finished speaking so that another play would replay the buffer

openrtx/src/core/voicePrompts.c

@@ -482,7 +482,10 @@ void vp_tick()
 
     // see if we've finished.
     if(vpCurrentSequence.pos == vpCurrentSequence.length)
-        voicePromptActive = false;
+    {
+        voicePromptActive     = false;
+        vpCurrentSequence.pos = 0;
+    }
 }
 
 bool vp_isPlaying()