[FIX] crm: do not erase activity_type_id field value when converting
[FIX] crm: do not erase activity_type_id field value when converting

activity_type_id is a related field on the first activity to do and should
probably not be reset / forced to a value. It is probably some code coming
from previous implementations of activities that were linked to crm only.

Coming notably from 87e457158e83295a17761a1ea0d251ba87472596 and 42226de46ea0cb2ff93f8e34af323fb1d805fce0 .

Community PR odoo/odoo#48946

closes odoo/odoo#48960

X-original-commit: de2e682824a636062fbb2c47b1bf5d7c7cef18db
Signed-off-by: Thibault Delavallee (tde) <2d325771bb6e8870d87f0f3f7b45589a8338e550@openerp.com>

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