Set flight modes bug?

This happens while switching between ArduCopter and ArduPlane models without restarting program first.

Problem:
- Flight modes have not been loaded from the APM device on connect.

Reproduce:
- have ArduPlane setup with modes (1-3 Stabilize, 4-6 Manual)
- connect ArduCopter, setup modes (1-3 Stabilize, 4-6 Loiter) and save to the APM
- connect ArduPlane, the set modes for ArduCopter are shown, not the setting that is set in the ArduPlane


Start by reproducing the ArduCopter-to-ArduPlane reconnect sequence described in the issue and compare the saved flight modes shown after each connection. Trace the flight-mode loading path during APM device connection; the work is done when each vehicle reloads and displays its own saved modes without restarting the program.

Written by the indexing model from the issue text.