use wav folder in speaker example

Author: FoamyGuy

examples/fruitjam_speaker.py

@@ -7,7 +7,7 @@
 
 pobj = adafruit_fruitjam.peripherals.Peripherals(audio_output="speaker")
 
-FILES = ["beep.wav", "dip.wav", "rise.wav"]
+FILES = ["wav/beep.wav", "wav/dip.wav", "wav/rise.wav"]
 VOLUMES = [0.25, 0.35, 0.50, 0.55, 0.60]
 
 while True: