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st/oxr: Return correct value

Weijiew Wang requested to merge quic_weijiew/monado:user/weijiew/return_correct_value into main

According to the OpenXR specs, it should return XR_TIMEOUT_EXPIRED and the image index should not be changed when the timeout expires.

If the timeout expires without the image becoming available for writing, XR_TIMEOUT_EXPIRED must be returned. If xrWaitSwapchainImage returns XR_TIMEOUT_EXPIRED, the next call to xrWaitSwapchainImage will wait on the same image index again until the function succeeds with XR_SUCCESS. Note that this is not an error code; XR_SUCCEEDED(XR_TIMEOUT_EXPIRED) is true.

Edited by Weijiew Wang

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