multimedia/gst123: Fix build on 13

Can't find ncurses during configure stage:
checking for ncurses >= 5... no
checking for ncurses6-config... false
checking for ncurses5-config... (cached) false
checking for ncurses-config... (cached) false
configure: error: Neither pkgconfig(ncurses) nor ncurses-config was found.

> Script "configure" failed unexpectedly.

PR: 284122
Fixes: 716c8f511a06 (Update 0.3.3 → 0.4.1 and remove DEPRECATED)