Fix for missed optimisation with grayscale same layouts #257
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The outer 'if' clause prevented the inner test on GRAYSCALE_ALPHA being reached, so when source and destination are the same the faster copy out from the decoder isn't used.
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The outer 'if' clause prevented the inner test on GRAYSCALE_ALPHA being reached, so when source and destination are the same the faster copy out from the decoder isn't used.