Fix: Replace Susz with Leszno

Susz is masculine, not neuter, so it should result in "Susz Mazowiecki",
"Susz Morski", and not "Susz Mazowieckie" or "Susz Morskie". However,
because order of the names whould not be changed, it was replaced with
Leszno, which is neuter.

src/table/townname.h

@@ -1480,7 +1480,7 @@ static const char * const _name_polish_2_n[] = {
 	"Pilzno",
 	"Przodkowo",
 	"Strzelno",
-	"Susz",
+	"Leszno",
 	"Jaworzno",
 	"Choszczno",
 	"Mogilno",