Enable keypad set and unset commands.

st.info

@@ -89,6 +89,7 @@ st| simpleterm,
 	ri=\EM,
 	rmacs=\E(B,
 	rmcup=\E[?1049l,
+	rmkx=\E>,
 	rmso=\E[23m,
 	rmul=\E[m,
 	sc=\E7,
@@ -100,6 +101,7 @@ st| simpleterm,
 	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,
 	smacs=\E(0,
 	smcup=\E[?1049h,
+	smkx=\E=,
 	smso=\E[3m,
 	smul=\E[4m,
 	tbc=\E[3g,