Over 400 rated engine gets SSW into a bad state if are using XL Gyro

[mrpopogod]

Describe the bug

Engines above 400 rating require additional slots in the CT, but that is space already taken up by an XL Gyro. If you bump the engine above 400 with an XL Gyro you get an error modal that the engine doesn't fit and it is reverting the engine to the previous setting. While it does revert the move code to the previous setting it completely clears out the engine crits. If you then try and change the engine type (e.g. you were trying out XXL and swap to regular Fusion) you get a second error modal that the engine cannot be allocated, then a third error modal immediately afterwards that SSW found itself borked and returns to the default new mech settings.

To Reproduce

Behavior exists on 0.7.3 and 0.7.5

1. Set tech level to Dark Ages and Experimental.
2. Assign an XL Gyro
3. Increase movement rating until it is above 400 (e.g. 21 walk on a 20 ton mech)
4. After the first error switch the engine's type (e.g. Fusion to Compact)

Expected behavior

After the first error modal I should be at the last known good walk value and my engine crits are allocated as appropriate for the engine currently selected.

Desktop (please complete the following information):

• Windows, JRE 11
• 0.7.3 and 0.7.5