DataHandle: improve readUTF implementation

Better to lean on the Java standard library here.

Author: ctrueden

src/main/java/org/scijava/io/DataHandle.java

@@ -572,10 +572,7 @@ default String readLine() throws IOException {
 
 	@Override
 	default String readUTF() throws IOException {
-		final int length = readUnsignedShort();
-		final byte[] b = new byte[length];
-		read(b);
-		return new String(b, "UTF-8");
+		return DataInputStream.readUTF(this);
 	}
 
 	// -- DataOutput methods --