Add shape definition for Ruida Controller

Author: mariuste

Elektronik/Wiring_Plan/wiring.d2

@@ -37,6 +37,7 @@ classes: {
 Ruida_644: {
   label: "Ruida RDC644G/S"
   style: { stroke: "#007AFF"; stroke-width: 3 }
+  shape: rectangle
 
   # General /Dedicated Output Port CN1
   CN1: {