While flying, warn when letting go of control or stop driving

[scarf005]

Summary

SUMMARY: Bugfixes "While flying, warn when letting go of control or stop driving"

Purpose of change

• Fixes Warning before stopping engine when flying #1924

Describe the solution

when trying to let go of control or stop driving while flying, warn "Really let go of controls while flying? This will result in a crash."

Describe alternatives you've considered

• make helicopters be able to fly without controls
• automatically land

either way won't take less than two ifs.

Testing

it works on my machine!

Additional context

Letting go of Control

Stopping Engine

[olanti-p]

Tidy complains

/home/runner/work/Cataclysm-BN/Cataclysm-BN/src/vehicle_use.cpp:617:56: error: insufficient spaces at this location.  2 required, but only 1 found. [cata-text-style,-warnings-as-errors]
            _( "Really let go of controls while flying? This will result in a crash." ) );
                                                       ^