input_engine: Pass LedStatus by const reference

Avoids copies where reasonably applicable

src/common/input.h

@@ -266,7 +266,7 @@ class OutputDevice {
 public:
     virtual ~OutputDevice() = default;
 
-    virtual void SetLED([[maybe_unused]] LedStatus led_status) {}
+    virtual void SetLED([[maybe_unused]] const LedStatus& led_status) {}
 
     virtual VibrationError SetVibration([[maybe_unused]] const VibrationStatus& vibration_status) {
         return VibrationError::NotSupported;

src/input_common/input_engine.h

@@ -114,7 +114,7 @@ public:
 
     // Sets a led pattern for a controller
     virtual void SetLeds([[maybe_unused]] const PadIdentifier& identifier,
-                         [[maybe_unused]] const Common::Input::LedStatus led_status) {}
+                         [[maybe_unused]] const Common::Input::LedStatus& led_status) {}
 
     // Sets rumble to a controller
     virtual Common::Input::VibrationError SetRumble(

src/input_common/input_poller.cpp

@@ -668,7 +668,7 @@ public:
     explicit OutputFromIdentifier(PadIdentifier identifier_, InputEngine* input_engine_)
         : identifier(identifier_), input_engine(input_engine_) {}
 
-    virtual void SetLED(Common::Input::LedStatus led_status) {
+    virtual void SetLED(const Common::Input::LedStatus& led_status) {
         input_engine->SetLeds(identifier, led_status);
     }