Avoid Debian specifics when starting from a GUI login manager

--- share/wlmaker.desktop.in.orig	2025-03-07 20:59:09 UTC
+++ share/wlmaker.desktop.in
@@ -1,5 +1,5 @@ Comment=A Wayland compositor inspired by Window Maker
 [Desktop Entry]
 Name=WaylandMaker
 Comment=A Wayland compositor inspired by Window Maker
-Exec=@CMAKE_INSTALL_PREFIX@/bin/wlmaker.sh
+Exec=wlmaker
 Type=Application