Removed the no smelting flag from Galena (#2652)

Author: Rundas01

src/main/java/gregtech/api/unification/material/materials/FirstDegreeMaterials.java

@@ -241,7 +241,6 @@ public static void register() {
         Galena = new Material.Builder(279, gregtechId("galena"))
                 .dust(3).ore()
                 .color(0x643C64)
-                .flags(NO_SMELTING)
                 .components(Lead, 1, Sulfur, 1)
                 .build();