fix style

Author: cxznmhdcxz

src/azure-cli/azure/cli/command_modules/vm/custom.py

@@ -2873,6 +2873,7 @@ def vm_run_command_update(cmd,
                           error_blob_uri=None,
                           no_wait=False):
     from .aaz.latest.vm.run_command import Update as _Update
+
     class Update(_Update):
         def pre_instance_update(self, instance):
             if tags is not None: