Increase max length of FAQPage - AcceptedAnswer textfield.

Here, I have tried this patch for the version 2.5.

Our customer requires to set several Questions and Answers into the metatag using the Pivot option, so it is better not to limit these fields maxLength and change the field type to textfield.

Here is the patch for 3.0 version.

This is the wrong approach - the parent PropertyTypeBase class shouldn't know about individual tags.