change default layout toggle to L_HORIZ

After issuing 'layout toggle split' command from tabbed/stacked layout,
layout should have been horizontally split.

sway/commands/layout.c

@@ -49,10 +49,10 @@ struct cmd_results *cmd_layout(int argc, char **argv) {
 		} else if (strcasecmp(argv[0], "splitv") == 0) {
 			parent->layout = L_VERT;
 		} else if (strcasecmp(argv[0], "toggle") == 0 && argc == 2 && strcasecmp(argv[1], "split") == 0) {
-			if (parent->layout == L_VERT) {
+			if (parent->layout == L_HORIZ) {
-				parent->layout = L_HORIZ;
-			} else {
 				parent->layout = L_VERT;
+			} else {
+				parent->layout = L_HORIZ;
 			}
 		}
 	}