When there is a quote template set on a sale order,
the email sent by default is the email
`Sales Order - Send by Email (Online Quote)`,
and this since 5153b2d281.
Therefore, there is no point to override the content of the
email template `Sales Order - Send by Email` to set
the quotation link in the email template, since this is not
this email which is being used for sales order with an
online quotation template.
Nevertheless, the link to the email quotation must be
put in the `Sales Order - Send by Email (Online Quote)`,
so the customer can access his online quotation directly
from the confirmation email, as it was designed and done
in the override of the `Sales Order - Send by Email`.
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