CLEANUP: cli: rename all occurrences of stconn "cs" to "sc"

Function arguments and local variables called "cs" were renamed to "sc"
in the various keyword handlers.
diff --git a/src/map.c b/src/map.c
index 76becb2..8308a7a 100644
--- a/src/map.c
+++ b/src/map.c
@@ -345,10 +345,10 @@
 static int cli_io_handler_pat_list(struct appctx *appctx)
 {
 	struct show_map_ctx *ctx = appctx->svcctx;
-	struct stconn *cs = appctx_cs(appctx);
+	struct stconn *sc = appctx_cs(appctx);
 	struct pat_ref_elt *elt;
 
-	if (unlikely(sc_ic(cs)->flags & (CF_WRITE_ERROR|CF_SHUTW))) {
+	if (unlikely(sc_ic(sc)->flags & (CF_WRITE_ERROR|CF_SHUTW))) {
 		/* If we're forced to shut down, we might have to remove our
 		 * reference to the last ref_elt being dumped.
 		 */