Update status of Email Campaign

[harshkhatri7287]

Set_email_campaign_status function was executing daily based on the hooks.py file, It was updating the status locally but was not saving it. With this added line status is being updated and saved.

[harshkhatri7287]

@barredterra I have done the change, please proceed this for testing.

[stale[bot]]

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[barredterra]

Duplicate of https://github.com/frappe/erpnext/pull/39776