test: refresh touchy ui-smoke for the new minimum-height patch

#4170 floors the touchy window height at 500 px so all
notebook tabs are usable on first launch. Refresh the committed
confirm reference so the ui-smoke comparison matches the new
patched layout instead of the old ~270 px window.

Also drop the fit screen size from 1024x768 to 1024x600: 1024x600 is
the 7" touchscreen panel touchy actually targets, and the new 500 px
floor still leaves room (touchy opens 984x500 inside 1024x600 so the
window-fit assertion passes).

Author: grandixximo

tests/ui-smoke/touchy-fit/test.sh

@@ -1,8 +1,9 @@
 #!/bin/bash
-# Regression guard: touchy must fit a small (1024x768) monitor. Boots
-# touchy on a small screen and fails if its window is larger than the
-# screen (see window-fit.sh). Phase 1 only; no program is run.
+# Regression guard: touchy must fit a 1024x600 panel, the common 7"
+# touchscreen size it targets. Boots touchy on that screen and fails
+# if its window is larger (see window-fit.sh). Phase 1 only; no
+# program is run.
 LIB_DIR="$(cd "$(dirname "$0")/../_lib" && pwd)"
-export UI_SMOKE_XVFB_SCREEN=1024x768x24
+export UI_SMOKE_XVFB_SCREEN=1024x600x24
 export UI_SMOKE_FIT_CLASS='("touchy" "Touchy")'
 exec "$LIB_DIR/run-gui.sh" touchy/touchy.ini