fix arg bug

Author: zewenli98

py/torch_tensorrt/dynamo/conversion/converter_utils.py

@@ -97,7 +97,7 @@ def cast_trt_tensor(
 
     if input_val.dtype != trt_dtype:
         source_ir = source_ir if source_ir is not None else SourceIR.UNKNOWN
-        target_str = ConverterRegistry.qualified_name_or_str(ConverterRegistry, target)
+        target_str = ConverterRegistry.qualified_name_or_str(target)
         target_name = f"{source_ir}_ops{('.' + target_str) if target_str else ''}"
 
         identity_layer = network.add_identity(input_val)