Fix: Fix typo, increase wait delay, and add wait calculation

Corrected typo in config key, increased default WaitDelay to 10 seconds, and added function to calculate wait delay for Nginx. The new delay calculation uses a hyperbolic tangent function to adjust delay dynamically based on login attempts. This should enhance security by increasing wait time progressively with each failed attempt.

Signed-off-by: Christian Roessner c@roessner.co