Rely on optimum-cli to be on PATH

Author: frenchwr

gimpopenvino/plugins/openvino_utils/tools/model_manager.py

@@ -857,7 +857,7 @@ def _download_model(self, model_id):
                         #print("optimun-cli full install path",full_install_path)
                         import subprocess
 
-                        optimum_ex = sys.executable.replace("python", "optimum-cli").replace("optimum-cli3", "optimum-cli")
+                        optimum_ex = "optimum-cli"
 
                         output_file = Path(os.path.join(full_install_path, "export_output.log"))
                         if(model_id != "sd_15_inpainting"):
@@ -1370,4 +1370,4 @@ def dl_sd_15_LCM(self, model_id, only_npu_recompilation=False):
 
         # Write the data to a JSON file
         with open(os.path.join(install_location, "stable-diffusion-1.5", model_1, file_name), 'w') as json_file:
-            json.dump(config, json_file, indent=4)
+            json.dump(config, json_file, indent=4)