st.info: replace the acsc entry from xterm to urxvt

The current acsc entry, copied from xterm was not exposing capability to
display arrows.

st.info

@@ -1,5 +1,5 @@
 st| simpleterm,
-	acsc=``aaffggiijjkkllmmnnooppqqrrssttuuvvwwxxyyzz{{||}}~~,
+	acsc=+C\,D-A.B0E``aaffgghFiGjjkkllmmnnooppqqrrssttuuvvwwxxyyzz{{||}}~~,
 	am,
 	bce,
 	bel=^G,