weston: Run at a more reasonable 1920x1080 resolution, not 1024x640.

The headless backend's defaults are quite low, and it was preventing
renderdoc replays from running any larger than that, which in turn cut off
the screenshots we wanted to take.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/41662>

.gitlab-ci/common/weston.sh

@@ -6,7 +6,12 @@ mkdir -p /tmp/.X11-unix
 export DISPLAY=:0
 
 WAYLAND_DISPLAY=wayland-0
-weston --config="$CI_COMMON_DIR/weston.ini" --socket="$WAYLAND_DISPLAY" --log "$RESULTS_DIR/weston.log" --logger-scopes=log,xwm-wm-x11 "$@" &
+weston --config="$CI_COMMON_DIR/weston.ini" \
+  --socket="$WAYLAND_DISPLAY" \
+  --log "$RESULTS_DIR/weston.log" \
+  --logger-scopes=log,xwm-wm-x11 \
+  --width 1920 --height 1080 \
+  "$@" &
 export WAYLAND_DISPLAY
 
 while [ ! -S /tmp/.X11-unix/X0 ]; do sleep 1; done