ITS: change config.yml default to most common value

bug: 229382497
Change-Id: I9a139bbd16e00b180c3d1ff48646ddb3f473cd27
diff --git a/apps/CameraITS/config.yml b/apps/CameraITS/config.yml
index 2a668c0..7302e3c 100644
--- a/apps/CameraITS/config.yml
+++ b/apps/CameraITS/config.yml
@@ -25,7 +25,7 @@
           - serial: <tablet_id>
             label: tablet
     TestParams:
-      brightness: 96
+      brightness: 192
       chart_distance: 31.0
       debug_mode: "False"  # quotes are needed here
       lighting_cntl: <controller-type>  # can be arduino or "None"