pa28-161: correct sim/model/fallback-model-index.
spitfireIX: correct sim/model/fallback-model-index.
DR400-dauphin: correct sim/model/fallback-model-index.
DR400: correct sim/model/fallback-model-index.
Fallback model index for Seafire and Spitfire V
Fallback model foe Seafire (use Spitfire!)
Q400: send sim/multiplay/fallback-model-index.
737-800: send sim/multiplay/fallback-model-index.
737-300: send sim/multiplay/fallback-model-index.
cri-cri: send sim/multiplay/fallback-model-index.
