Adds 5 satchels for jobs when selecting "satchel" for backpack pref from code 

These icons weren't being used, and while I was digging around and looking at all the pretty crates I found these and decided "I'm going to integrate these!"

This only works if they selected "satchel", not "satchel_alt" so they can use something different than that simple white/gray satchel.

Enabled for RD, Xenobiologist , Scientist, Botanist, Virologist, Geneticist(disabled but still in code), Chemist.