This reverts commit 7940a6a728be8f6b4ec36eecfd7c5291da4fdc81.
Queing of fan updates via GCodeRequestQueue is only valid if updates
originate from gcode commands. The heater_fan, controller_fan, and
temperature_fan modules could send updates asynchronously. Revert the
fan queuing changes until this issue can be resolved.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>