[FIX] mass_mailing: Use werzeug.urls instead of urlparse
[FIX] mass_mailing: Use werzeug.urls instead of urlparse

werkzeug.urls is used instead of urlparse since https://github.com/odoo/odoo/commit/01e35141479b8dfc4a390518f89fc52e7cec5396#diff-f72572eec7ff7bbeca23ba84eda9fc38L35

Error introduced by forwardport https://github.com/odoo/odoo/commit/ba294a397e6ee3eb7dd0153f0726a880f6b77459

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