Expose StructuredDataConverter#removeBackupTag (#3838)

common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_5to1_20_3/rewriter/StructuredDataConverter.java

@@ -692,7 +692,7 @@ public final class StructuredDataConverter {
         return subTag;
     }
 
-    static @Nullable CompoundTag removeBackupTag(final CompoundTag tag) {
+    public static @Nullable CompoundTag removeBackupTag(final CompoundTag tag) {
         final CompoundTag backupTag = tag.getCompoundTag(BACKUP_TAG_KEY);
         if (backupTag != null) {
             tag.remove(BACKUP_TAG_KEY);