Units have two links with hidden, change to one link with multiple "set primary cats"

[nstephenh]

A lot of our units are set up to have two links with hidden conditions, when instead they could be set up to be two links with "set primary category"
Doing this would probably break lists.
Note that the multiple entries thing confused new recruit for a bit (now fixed)

https://discord.com/channels/736936369670193332/1248273866468626485/1248273866468626485

[Mayegelt]

An issue with this is having multiple ones linked together can make the units display name become really long. This is an example of a stat change changing a name. But on occasions it can change a lot.

[nstephenh]

@Mayegelt So we need to investigate if a set category changes any names in output on battlescribe/if we care, compared to new recruit?