F411 are often 100% cpu

* reports that F411 are often 100% fixable with pid-demon 2 or less filtering.
* suggest some logic near https://github.com/emuflight/EmuFlight/blob/c9cb676f1ed13222e80e7ee8dc00b65cb806b489/src/main/flight/pid.c#L87 to define pid-denom 2 `if defined (STM32F411xE)`