Use G1 for alternate charset

St has enacs, which must be printed if a program requires to use
the alternate charset (graphic charset), that in st case was to
select charset graphic for G1, but it was not useful
at all because smacs and rmacs were always redefining the value
of G0.

st.info

@@ -159,7 +159,7 @@ st| simpleterm,
 	rev=\E[7m,
 	ri=\EM,
 	ritm=\E[23m,
-	rmacs=\E(B,
+	rmacs=^O,
 	rmcup=\E[?1049l,
 	rmir=\E[4l,
 	rmkx=\E[?1l\E>,
@@ -175,7 +175,7 @@ st| simpleterm,
 	sgr0=\E[0m,
 	sgr=%?%p9%t\E(0%e\E(B%;\E[0%?%p6%t;1%;%?%p2%t;4%;%?%p1%p3%|%t;7%;%?%p4%t;5%;%?%p7%t;8%;m,
 	sitm=\E[3m,
-	smacs=\E(0,
+	smacs=^N,
 	smcup=\E[?1049h,
 	smir=\E[4h,
 	smkx=\E[?1h\E=,