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Port 1322 to float-pc: add FIX_958_667_DISABLE_INITIAL_PLC_SUPPRESSION

norvell requested to merge 1429_ref_DISABLE_INITIAL_PLC_SUPPRESSION into float-pc

This is a small one-line fix to maintain EVS bit-exactness for the IVAS BASOP code. The IVAS implementation of the decoder outputs zeros if the decoded bitstream starts with lost packets, while the EVS BASOP triggers the EVS decoder with a bad frame indicator set and uses the output. In EVS float the output is zero, but for EVS BASOP the output is a +/- 1 LSB noise. This fix sets the hasDecodedFirstGoodFrame = true in EVS operation, such that the IVAS BASOP decoder matches the behavior of the EVS BASOP decoder.

The fix is already merged to the BASOP main, but not to ivas-float-update. It is also not really needed since the EVS float outputs zeros, but it is added to align the code.

No review is needed for this one. All should be BE.

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