[FIX] website_mail.editor.js moved but still referenced

Commit 0c89ca0f8f2d96e37353348fe33591da8142368b moves
website_mail.editor.js but is still referenced in website_mail.xml
Merge pull request #263 from odoo-dev/master-fix-asset-fme

[FIX] website_mail.editor.js moved but still referenced

Commit 0c89ca0 moves
website_mail.editor.js but is still referenced in website_mail.xml