Revert "make UInt192Type a HashType"

This reverts commit 39e485a.

Author: nkramer44

xrpl4j-core/src/main/java/org/xrpl/xrpl4j/codec/binary/types/UInt192Type.java

@@ -8,7 +8,7 @@
 /**
  * Codec for XRPL UInt192 type.
  */
-public class UInt192Type extends HashType<UInt192Type> {
+public class UInt192Type extends UIntType<UInt192Type> {
 
   public static final int WIDTH_BYTES = 24;
 
@@ -17,7 +17,7 @@ public UInt192Type() {
   }
 
   public UInt192Type(UnsignedByteArray list) {
-    super(list, WIDTH_BYTES);
+    super(list, WIDTH_BYTES * 8);
   }
 
   @Override
@@ -29,4 +29,9 @@ public UInt192Type fromParser(BinaryParser parser) {
   public UInt192Type fromJson(JsonNode node) {
     return new UInt192Type(UnsignedByteArray.fromHex(node.asText()));
   }
+
+  @Override
+  public JsonNode toJson() {
+    return new TextNode(toHex());
+  }
 }