fix progress to maxed milestone appearing twice

hypixel shows the progress on milestones of 20 and above, and skyhanni was showing it in 20 and below, so it showed both if you had a milestone at 20

src/main/java/at/hannibal2/skyhanni/features/garden/inventory/GardenCropMilestoneInventory.kt

@@ -58,7 +58,7 @@ class GardenCropMilestoneInventory {
 
         val crop = GardenCropMilestones.getCropTypeByLore(event.itemStack) ?: return
         val tier = GardenCropMilestones.getTierForCropCount(crop.getCounter(), crop)
-        if (tier > 20) return
+        if (tier >= 20) return
 
         val maxTier = GardenCropMilestones.getMaxTier()
         val maxCounter = GardenCropMilestones.getCropsForTier(maxTier, crop)