fix: reorder encoder pins

This reflects the proper wiring of the motors

controller/controller.ino

@@ -33,7 +33,7 @@ Repo: https://gitlab.uliege.be/thlamb/mecharaptor-controller
 #define CLK_PIN 2  // Encoder CLK
 #define DO_PIN 8   // Encoder Digital Output
 #define CSN_PINS \
-  { 3, 4, 5, 6 }  // Encoder Chip Select pins
+  { 6, 5, 4, 3 }  // Encoder Chip Select pins
 
 #define CUR1_PIN A1   // Current measurement for Front motor
 #define CUR2_PIN A2   // Current measurement for Aft motor