Fix multi render pipeline screenshot test. Fix checkerboard test though not enabled. (#580)

Signed-off-by: jiaweig <[email protected]>

Scripts/CheckerboardTest.bv.lua

@@ -21,6 +21,6 @@ SelectImageComparisonToleranceLevel("Level F")
 
 IdleFrames(10) 
 
-CaptureScreenshot(g_testCaseFolder .. 'frame1.png')
+CaptureScreenshot(g_testCaseFolder .. '/frame1.png')
 
 OpenSample(nil)

Scripts/MultiRenderPipeline.bv.lua

@@ -78,8 +78,8 @@ SelectImageComparisonToleranceLevel("Level F")
 
 -- IBL only
 SetImguiValue('Add/Remove IBL', true)
--- IBL takes 2 frames to apply 
-IdleFrames(2) 
+-- IBL takes some frames to apply 
+IdleFrames(5)
 TakeScreenShotForWindow1('IBL_window1.png')
 TakeScreenShotForWindow2('IBL_window2.png')