MT#10045 Use form->values instead of form->params for contract forms

To process checkbox correctly

(cherry picked from commit 331f1b35826deae276f4a3f7382aa88841758b00)

Conflicts:
	lib/NGCP/Panel/Controller/Contract.pm
	lib/NGCP/Panel/Controller/Customer.pm

(cherry picked from commit 37396095c935581102532c182a2ba644f5d9c99d)