fix expected exception message

Author: johnjaylward

src/test/java/org/json/junit/JSONMLTest.java

@@ -98,7 +98,7 @@ public void nonXMLException() {
             fail("Expecting an exception");
         } catch (JSONException e) {
             assertEquals("Expecting an exception message",
-                "Bad XML at 23 [character 24 line 1]",
+                "Bad XML at 24 [character 25 line 1]",
                 e.getMessage());
         }
     }