Update src/main/java/com/gmail/nossr50/skills/repair/Repair.java

When DowngradeChance is 0 random can be the same (0 to 99) so can't be <= becouse downgrade will continue

src/main/java/com/gmail/nossr50/skills/repair/Repair.java

@@ -114,7 +114,7 @@ public class Repair {
                 int enchantLevel = enchant.getValue();
 
                 if (configInstance.getArcaneForgingDowngradeEnabled() && enchantLevel > 1) {
-                    if (random.nextInt(100) <= getDowngradeChance(rank)) {
+                    if (random.nextInt(100) < getDowngradeChance(rank)) {
                         is.addEnchantment(enchantment, --enchantLevel);
                         downgraded = true;
                     }