[non-BE] Resolve "Wrong scaling for comparison in edge_detect_fx()"

• Related issues: #2591 (closed)
• Requested reviewers: @vaillancour or @malenovskyvl

Reason why this change is needed

• Wrong scaling used in comparison in edge_detect_fx().

Description of the change

• Correct the scaling.

Affected operating points

• Potentially, stereo operating points are non-BE.

Closes #2591 (closed)