emulated_controller: Remove unused parameter in GetMappedDevices()

This isn't used, so it can be removed to make the function a little
nicer.

src/core/hid/emulated_controller.cpp

@@ -424,8 +424,7 @@ void EmulatedController::RestoreConfig() {
     ReloadFromSettings();
 }
 
-std::vector<Common::ParamPackage> EmulatedController::GetMappedDevices(
-    EmulatedDeviceIndex device_index) const {
+std::vector<Common::ParamPackage> EmulatedController::GetMappedDevices() const {
     std::vector<Common::ParamPackage> devices;
     for (const auto& param : button_params) {
         if (!param.Has("engine")) {

src/core/hid/emulated_controller.h

@@ -244,7 +244,7 @@ public:
     void RestoreConfig();
 
     /// Returns a vector of mapped devices from the mapped button and stick parameters
-    std::vector<Common::ParamPackage> GetMappedDevices(EmulatedDeviceIndex device_index) const;
+    std::vector<Common::ParamPackage> GetMappedDevices() const;
 
     // Returns the current mapped button device
     Common::ParamPackage GetButtonParam(std::size_t index) const;

src/yuzu/configuration/configure_input_player.cpp

@@ -855,8 +855,7 @@ void ConfigureInputPlayer::UpdateInputDeviceCombobox() {
         return;
     }
 
-    const auto devices =
-        emulated_controller->GetMappedDevices(Core::HID::EmulatedDeviceIndex::AllDevices);
+    const auto devices = emulated_controller->GetMappedDevices();
     UpdateInputDevices();
 
     if (devices.empty()) {