Fix unused parameter warnings

autotests/libinput/mock_libinput.cpp

@@ -75,6 +75,7 @@ int libinput_device_config_tap_get_finger_count(struct libinput_device *device)
 
 enum libinput_config_tap_state libinput_device_config_tap_get_enabled(struct libinput_device *device)
 {
+    Q_UNUSED(device)
     return LIBINPUT_CONFIG_TAP_DISABLED;
 }
 

input.cpp

@@ -980,6 +980,8 @@ void InputRedirection::setupWorkspace()
             [this] (FakeInputDevice *device) {
                 connect(device, &FakeInputDevice::authenticationRequested, this,
                     [this, device] (const QString &application, const QString &reason) {
+                        Q_UNUSED(application)
+                        Q_UNUSED(reason)
                         // TODO: make secure
                         device->setAuthentication(true);
                     }