Save the ptr position before lowering via kbd, so as to be able to cycle

back with the pointer in the right place; matches behaviour when
lowering via the mouse function.

kbfunc.c

@@ -41,6 +41,7 @@ extern sig_atomic_t	xev_quit;
 void
 kbfunc_client_lower(struct client_ctx *cc, union arg *arg)
 {
+	client_ptrsave(cc);
 	client_lower(cc);
 }