Make Default Testing Config Canonical Config

Differential Revision: D49214927

fbshipit-source-id: 44a276d31f5c79dad32eb7ac62d80dcb9dbf6439

Author: mcr229

backends/xnnpack/test/tester/tester.py

@@ -124,7 +124,7 @@ def graph_module(self) -> str:
 @register_stage
 class Export(Stage):
     def __init__(self, capture_config: Optional[CaptureConfig] = None):
-        self.capture_conf = capture_config or get_xnnpack_capture_config()
+        self.capture_conf = capture_config or CaptureConfig(enable_aot=True)
         self.exir_exported_program = None
 
     def run(self, artifact: torch.nn.Module, inputs) -> None: