Store spell glitch

[Miloch]

When adding a spell (such as sppr713) to a store, it says <not in speldesc.2da> even though it clearly is with an assigned string description, 44909 by default in BG2. Seems a bit buggish. Actually, it says this even in vanilla BG2 stores like temtalos.sto.

[Avenger]

Quick fix: extract speldesc.2da and add a line terminator to the last line.

I've fixed this locally, but this really doesn't worth a new release.