Fix type

Author: XingY

api/src/org/labkey/api/query/QueryChangeListener.java

@@ -103,7 +103,7 @@ enum QueryProperty
         Hidden(Boolean.class),
         SchemaName(String.class),
         ColumnName(String.class),
-        ColumnType(PropertyType.class),;
+        ColumnType(PropertyDescriptor.class),;
 
         private final Class<?> _klass;