[DONE] Ability to use `customItemPreviewIndex` for normal items too

[Yankes]

Small change to craft equip screen, in OXCE 7.12.4 items too can use `customItemPreviewIndex: [21]` like vehicles did.

Example of this working:

[ps]
until lxnt.wtf is down I make backup server: http://108.61.157.159/versions/win/ (soon new version should be ready)