GWT Accelerometer: report availability only if sensor is present #5758
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GWT Accelerometer is reported as present if the web browser supports it even if there is no accelerometer. This is not correct, using Chrome on Desktop reports an available accelerometer.
This commit changes getPeriphalAvailable in a way that accelerometer availability is only returned if real sensor data is present, this matches the behaviour of the other platforms.
Note: At first I wanted to use the onError callback of the sensor, but it was called on my mobile device too. I was not able to find out why, because the callback provides no error message.
Sorry for the diff. GwtInput had CRLF line endings which I was not able to commit. I think this is okay because (most) libGDX sources have LF line endings in general.