Fix for 3GPP issue 1365: Narrowband difference between BASOP decoder and float...

Fix for 3GPP issue 1365: Narrowband difference between BASOP decoder and float decoder with McMASA bitstream

Link #1365

With these changes, the narrowband difference for the 1st channel is eliminated. However, for the 2nd channel, even after using 64-bit calculations for energyBuildup_fx, there is still a loss of precision. When comparing energyBuildup >= 1.0f, the value for fixed is 1.00006783, while for float it is 0.999947906.