input: do not update timings & stats if paused
The values will typically not change while waiting for control requests and not processing the demux and outputs. Even if the values do change (e.g. due to a seek request), the demux needs to be called to recompute the updated values: see demux_Control() calls in MainLoopStatistics(). Note that the intrinsic computational savings from this commit are probably negligible. The interesting aspect is the removal of one wake-up source within the input control loop. This commit does not remove nor add any wake-up however.
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