Resolve "basop-2547-some-conditions-in-core_switching_post_dec_fx-were-wrong"[non-be][renderer-non-BE]

• Related issues: #2547 (closed)
• Requested reviewers: @vaclav

Reason why this change is needed

Some conditions in fixed don't seem to reflect the floating point condition

Description of the change

matching conditions to float

Affected operating points

few conditions for the decoder in bitrate switching only. Encoder is BE

Closes #2547 (closed)