x11/polybar: Fix build against x11/xcb-proto 1.13.

• Update to a more recent upstream commit to fix the build against xcb-proto 1.13
• Drop upstreamed patches, which already included now
• Give MAINTAINERSHIP to lbdm

PR: 228330
Submitted by: Alexandre C. Guimarães <lebarondemerde@privacychain.ch>
Approved by: <capt_redbeard@protonmail.com> (maintainer timeout)
Differential Revision: https://reviews.freebsd.org/D15965