Fix patterns

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_13to1_12_2/providers/blockentities/BannerHandler.java

@@ -1,6 +1,8 @@
 package us.myles.ViaVersion.protocols.protocol1_13to1_12_2.providers.blockentities;
 
 import com.github.steveice10.opennbt.tag.builtin.CompoundTag;
+import com.github.steveice10.opennbt.tag.builtin.IntTag;
+import com.github.steveice10.opennbt.tag.builtin.ListTag;
 import com.github.steveice10.opennbt.tag.builtin.Tag;
 import us.myles.ViaVersion.api.data.UserConnection;
 import us.myles.ViaVersion.api.minecraft.Position;
@@ -36,6 +38,15 @@ public class BannerHandler implements BlockEntityProvider.BlockEntityHandler {
         else
             System.out.println("Why does this block have the banner block entity? :(" + tag);
 
+        if (tag.get("Patterns") instanceof ListTag) {
+            for (Tag pattern : (ListTag) tag.get("Patterns")) {
+                if (pattern instanceof CompoundTag) {
+                    IntTag c = ((CompoundTag) pattern).get("Color");
+                    c.setValue(15 - c.getValue()); // Invert color id
+                }
+            }
+        }
+
         return blockId;
     }