app.py: switching up the job type for v2

app.py

@@ -42,7 +42,7 @@ class Prodia:
 
 
     def generate_v2(self, config):
-        response = self._post("https://inference.prodia.com/v2/job", {"type": "v2.job.sdxl.txt2img", "config": config}, v2=True)
+        response = self._post("https://inference.prodia.com/v2/job", {"type": "inference.sdxl.txt2img.v1", "config": config}, v2=True)
         return Image.open(BytesIO(response.content)).convert("RGBA")