Fix serial flag usage

src/main.rs

@@ -57,14 +57,6 @@ fn main() -> ! {
     let peripheral_clock = clocks.peripheral_clock.freq();
 
     let mut hid: Box<dyn MouseInfoSender> = if SERIAL {
-        Box::new(MouseHID::new(
-            pac.USBCTRL_REGS,
-            pac.USBCTRL_DPRAM,
-            &mut pac.RESETS,
-            core,
-            clocks,
-        ))
-    } else {
         Box::new(CustomHID::new(
             pac.USBCTRL_REGS,
             pac.USBCTRL_DPRAM,
@@ -72,6 +64,14 @@ fn main() -> ! {
             clocks,
             10,
         ))
+    } else {
+        Box::new(MouseHID::new(
+            pac.USBCTRL_REGS,
+            pac.USBCTRL_DPRAM,
+            &mut pac.RESETS,
+            core,
+            clocks,
+        ))
     };
 
     // The single-cycle I/O block controls our GPIO pins