Fixes #1440 - Logical switches state not reset after model load

* logical switches reset not called anymore when user selects "Reset Flight", but only after model load
* logical switches reset now includes a reset of switches state (set to false)

Closes #1440 

@bsongis I strongly think that logical switches state should not be affected by the `Reset Flight` user selection. Imagine having a some kind of safety LS setup for electric motor, that would be compromised by the LS reset.

That is why I removed LS reset from the  `Reset Flight` function and moved it to model load section where a reset of LS makes sense. Do you agree?