Fix EdgeTPU output directory (ultralytics#7399)

* Fix EdgeTPU output directory

Outputs to same directory as --weights

* Update export.py

export.py

@@ -387,7 +387,7 @@ def export_edgetpu(keras_model, im, file, prefix=colorstr('Edge TPU:')):
         f = str(file).replace('.pt', '-int8_edgetpu.tflite')  # Edge TPU model
         f_tfl = str(file).replace('.pt', '-int8.tflite')  # TFLite model
 
-        cmd = f"edgetpu_compiler -s {f_tfl}"
+        cmd = f"edgetpu_compiler -s -o {file.parent} {f_tfl}"
         subprocess.run(cmd, shell=True, check=True)
 
         LOGGER.info(f'{prefix} export success, saved as {f} ({file_size(f):.1f} MB)')