x11/xfce4-terminal: Import middle mouse paste fix from upstream

Replace custom revert with upstream provided patch.

Related upstream bug report: https://gitlab.xfce.org/apps/xfce4-terminal/-/issues/385

Obtained from: https://gitlab.xfce.org/apps/xfce4-terminal/-/commit/765c984f680469f32cd30fe5cea63fa3af6fc1df