Take filament flow ratio into account when displaying flow in gcode legend

[SoftFever]

Description

Orca now take "Flow ratio" value in filament settings into account when display flow for each extrusion in g-code legend.

[igiannakas]

@SoftFever this commit seems to have caused the flow rate to reduce quadratically :). #6478

Flow rate 1:

Flow rate 0.5:

Flow rate 0.5 with this commit reverted:

With a bit of chat GPT help, to do the math, based on the emitted GCODE the flow rate with the commit reverted seems to be the right one

Gcode for external perimeter with 50% flow rate:

G1 F8400
G1 X192.35 Y187.35
G1 X157.65 Y187.35 E.23739
G1 X157.65 Y152.65 E.23739
G1 X192.35 Y152.65 E.23739
G1 X192.35 Y187.35 E.23739
G1 X192.302 Y187.337

[igiannakas]

This prob happens because the post processor already has baked in the mm3_mm value as part of the emitted Gcode I would hazard a guess