CameraITS: relax the lens shading test

For the corner brighter than center check.

Bug: 30448684
Change-Id: Id93eb6c9cbd97d7eaec5116029fad592bf746a48
(cherry picked from commit f479e09433c1b6141a3b3971b130677e43f0fe78)
diff --git a/apps/CameraITS/tests/scene5/test_lens_shading_and_color_uniformity.py b/apps/CameraITS/tests/scene5/test_lens_shading_and_color_uniformity.py
index 282b82e..8e9f740 100644
--- a/apps/CameraITS/tests/scene5/test_lens_shading_and_color_uniformity.py
+++ b/apps/CameraITS/tests/scene5/test_lens_shading_and_color_uniformity.py
@@ -43,7 +43,7 @@
     # Threshold for pass/fail
     THRES_LS_CT = 0.9    # len shading allowance for center
     THRES_LS_CN = 0.6    # len shading allowance for corner
-    THRES_LS_HIGH = 0.05 # max allowed percentage for a patch to be brighter
+    THRES_LS_HIGH = 0.2  # max allowed percentage for a patch to be brighter
                          # than center
     THRES_UFMT = 0.1     # uniformity allowance
     # Drawing color