main-cleanup-PixelConditionsData

As was pointed out in a previous MR (!64185 (comment 6896367) ), the original formula for Charge/Time-over-threshold conversion accidentally promotes the variables to double by including a double numerical constant. This MR maintains the float precision while recasting the formula to have less divisions (and so be marginally faster), but will likely break FT0 due to numerical precision and order of execution change.