Fix contextnet type

Signed-off-by: smajumdar <[email protected]>

app.py

@@ -151,7 +151,7 @@ def resolve_model_type(model_name: str) -> str:
     elif 'citrinet' in model_name:
         return 'ctc'
     elif 'contextnet' in model_name:
-        return 'ctc'
+        return 'rnnt'
 
     return None