Bluetooth: host: Fix L2CAP reconfigure response with invalid CID

When an L2CAP_CREDIT_BASED_RECONFIGURE_REQ packet is received with
invalid parameters, the recipient shall send an
L2CAP_CREDIT_BASED_RECONFIGURE_RSP PDU with a non-zero Result field
and not change any MTU and MPS values.

This fix incorrectly reconfiguring valid channels while responding with
0x003 (Reconfiguration failed - one or more Destination CIDs invalid)
result code.

Signed-off-by: Szymon Janc <szymon.janc@codecoup.pl>