[X11] Do case-insensitive search for pen inversion detection

platform/linuxbsd/display_server_x11.cpp

@@ -275,7 +275,7 @@ bool DisplayServerX11::_refresh_device_info() {
 		xi.pen_pressure_range[dev->deviceid] = Vector2(pressure_min, pressure_max);
 		xi.pen_tilt_x_range[dev->deviceid] = Vector2(tilt_x_min, tilt_x_max);
 		xi.pen_tilt_y_range[dev->deviceid] = Vector2(tilt_y_min, tilt_y_max);
-		xi.pen_inverted_devices[dev->deviceid] = (bool)strstr(dev->name, "eraser");
+		xi.pen_inverted_devices[dev->deviceid] = String(dev->name).findn("eraser") > 0;
 	}
 
 	XIFreeDeviceInfo(info);