ui: disable 3rd-party tx-urls when wallet disabled

Summary:

This PR closes #17683 by removing 3rd-party Url-Label and -TextBox from Display Options in wallet-disabled mode.

Issue 17683:

The part of the GUI that this setting is relevant for does not exist in a --disable-wallet build.

This is a backport of Core PR17694

Test Plan:
src/qt/bitcoin-qt -disablewallet

In menu Settings -> Options -> Display, verify that the *Third party transaction URLs` setting is not visible.

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D8303