fix substrate pin of vnpn_10x10.sym (was named "B" instead of "S")

cells/xschem/symbols/vnpn_10x10.sym

@@ -33,7 +33,7 @@ L 4 0 -10 20 -30 {}
 B 5 17.5 -32.5 22.5 -27.5 {name=C dir=inout pinnumber=3}
 B 5 -22.5 -2.5 -17.5 2.5 {name=B dir=in pinnumber=1}
 B 5 17.5 27.5 22.5 32.5 {name=E dir=inout pinnumber=2}
-B 5 17.5 -2.5 22.5 2.5 {name=B dir=in pinnumber=1}
+B 5 17.5 -2.5 22.5 2.5 {name=S dir=in pinnumber=1}
 P 4 4 20 30 13.75 13.75 3.75 23.75 20 30 {fill=true}
 T {m=@m} 22.5 11.25 0 0 0.2 0.2 {layer=13}
 T {@model} 22.5 -15 0 0 0.2 0.2 {}