Set correct direction for left motor

src/tb6612fng.rs

@@ -91,14 +91,19 @@ impl Tb6612fng {
         self.standby.set_high();
     }
 
-    pub fn move_left(&mut self, value: Movement) {
+    pub fn move_right(&mut self, value: Movement) {
         let (i1, i2, duty) = value.into_command();
         self.a1.set_state(i1);
         self.a2.set_state(i2);
         self.pwm.set_duty(Channel::C3, duty);
     }
 
-    pub fn move_right(&mut self, value: Movement) {
+    pub fn move_left(&mut self, value: Movement) {
+        let value = if let Movement::Advance(v) = value {
+            Movement::Advance(-v)
+        } else {
+            value
+        };
         let (i1, i2, duty) = value.into_command();
         self.b1.set_state(i1);
         self.b2.set_state(i2);