ITS: test_preview_distortion: Improve distortion detection error

Fix 1: Update distortion tolarances
Fix 2: Fix structure of corners data to match with projected data to get correct distortion errors
Fix 3: Use RMS instead of mean to avoid normalization of negative and positive errors.
Fix 4: Need 4/3 aspect ratio to detect ArUco markers.
Fix 5: Fix color of plot to Red

Bug: 331975496
Test: test_preview_distortion.py
Change-Id: Ibdf636936e7c66ad6feb43e86e25c04f8a038107