Propulsion Speed Comparison UI Bug

[Raptor959]

Describe the bug
The Unit Designer propulsion tab fails to compare the unit propulsion performance stats of different unit designs with the same propulsion type.

To Reproduce
Open the unit designer.
Design multiple units with different combinations of turrets and bodies but identical propulsion types.
Open the propulsion tab for a completed unit design.
Hover the mouse over a different completed unit design with the same type of propulsion.

Expected behavior
The UI graphs and values for Road Speed, Off-Road Speed, Water Speed, And Weight should change to reflect the differences.