AAC encoder: in IS, fix index of sf_idx, band_type
Correct addressing of sf_idx and band_type arrays in I/S code. Both arrays don't guarantee valid values for subwindows at all times, depending on which coder is being used, which could result in reading of garbage values. Instead, only the first subwindow in the window group has to be used, ie: use w*16+g instead of (w+w2)*16+g
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