[FIX] crm: convert lead to opportunity

- Create a contact
- Create a lead
- Convert lead to opportunity w/ link to existing customer option

Salesperson on the lead to opportunity merge overrides the salesperson
in the contact record.

Link with existing customer should not override salesperson on contact
record. The two fields should be independent of each other unless you
are creating a new contact.

opw-659028
opw-740526