incorrect default params in SITL

This was noticed by @lthall, but I have reproduced as well with MP 1.1.6330.31130

When using quadplane frame in MP SITL, the default parameters don't come out right.
The most noticeable is the accel offsets aren't set, so you can't arm, but other more significant parameters are wrong too, such as Q_ENABLE=0
The right params are here:
https://github.com/ArduPilot/ardupilot/blob/master/Tools/autotest/default_params/quadplane.parm
The mapping of what param files should be used for each vehicle type is in the python code here:
https://github.com/ArduPilot/ardupilot/blob/master/Tools/autotest/pysim/vehicleinfo.py
maybe that needs to be moved into something like a JSON or XML file?

Start by comparing the Mission Planner SITL quadplane setup with Tools/autotest/default_params/quadplane.parm and the vehicle-to-parameter mapping in Tools/autotest/pysim/vehicleinfo.py. Reproduce the MP SITL configuration using the reported version, then verify that the quadplane defaults include the accelerometer offsets, Q_ENABLE=1, and the other values from quadplane.parm.

Written by the indexing model from the issue text.