Remove vestigial monitor configuration info

The x/y fields in monitor rules are unused and were meant to be deleted.
Also removes the outdated comment in config.h.

config.def.h

@@ -25,9 +25,7 @@ static const Layout layouts[] = {
 	{ "[M]",      monocle },
 };
 
-/* monitors
- * The order in which monitors are defined determines their position.
- * Non-configured monitors are always added to the left. */
+/* monitors */
 static const MonitorRule monrules[] = {
 	/* name       mfact nmaster scale layout       rotate/reflect x y */
 	/* example of a HiDPI laptop monitor:

dwl.c

@@ -191,8 +191,6 @@ typedef struct {
 	float scale;
 	const Layout *lt;
 	enum wl_output_transform rr;
-	int x;
-	int y;
 } MonitorRule;
 
 typedef struct {