[config-setup]: Fix a bug of checking if updategraph is enabled #7093
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Why I did it
Encounter error during "config-setup boot" if the updategraph is enabled.
How I did it
Correct the code inside the config-setup script.
Remove the space between the assignment operator.
How to verify it
Remove the /etc/sonic/config_db.json and reboot the device.
Originally, it will return following error after boot up.
rv: command not found
After modification, it can correctly parse the status of updategraph without error.
Which release branch to backport (provide reason below if selected)
Description for the changelog
Fix a bug of checking if updategraph is enabled in config-setup script.
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