input_engine: std::move engine name where applicable

We can allow the name to be moved into, allowing allocations to be
avoided.

src/input_common/drivers/touch_screen.cpp

@@ -13,7 +13,7 @@ constexpr PadIdentifier identifier = {
     .pad = 0,
 };
 
-TouchScreen::TouchScreen(const std::string& input_engine_) : InputEngine(input_engine_) {
+TouchScreen::TouchScreen(std::string input_engine_) : InputEngine(std::move(input_engine_)) {
     PreSetController(identifier);
 }