Fix for 3GPP issue 818: example of under performing code from complexity and...

Fix for 3GPP issue 818: example of under performing code from complexity and precision point of view

[x] Made the suggested changes in #818 (closed).

EVS 26.444 BE test passes.
decoder pytests:
MLD scores:
Original inputs: 562 failed, 374 skipped
MLD > 10: 46
MLD > 5 : 108
MLD < 5 : 408
+10dB inputs: 562 failed, 374 skipped
MLD > 10: 168
MLD > 5 : 185
MLD < 5 : 209
-10dB inputs: 562 failed, 374 skipped
MLD > 10: 10
MLD > 5 : 50
MLD < 5 : 502

encoder pytests results:
MLD scores:
Original inputs: 562 tests:
MLD > 10: 18
MLD > 5 : 45
MLD < 5 : 499
+10dB inputs: 562 tests:
MLD > 10: 42
MLD > 5 : 128
MLD < 5 : 392
\-10dB inputs: 562 tests:
MLD > 10: 5
MLD > 5 : 19
MLD < 5 : 538