Update themes.json

settings/themes.json

@@ -20,7 +20,7 @@
     "captionTop": 128,
     "captionRight": 1220,
     "captionLeft": 640,
-    "backgroundImage": "1280x720 cu-dj-audiogram.png",
+    "backgroundImage": "1280x720-cu-dj-audiogram.png",
     "foregroundColor": "#fc0",
     "waveBottom": 660,
     "waveTop": 320