P2P: Fix provision discovery response handling in some cases

P2P: Fix provision discovery response handling in some cases

Commit 6b56cc2d97fe9efd1feea8d418714b4658b056f1 added a possible call to
p2p_reset_pending_pd() prior to checking config_methods match between
our request and peer response. That reset call could clear
dev->req_config_methods and as such, result in unexpected
P2P-PROV-DISC-FAILURE report here even in cases where the peer accepts
the provision discovery. Fix this by using a local copy of the
req_config_methods variable.

Signed-hostap: Jouni Malinen <j@w1.fi>