Lower correlation threshold in flush-finish tests
Lower correlation threshold in flush-finish tests

This is low-risk fix for flakiness on some platforms. Long-term solution
would be to improve calibration.

Bug: 22301848
Change-Id: I028c2526d8e99fa3b333574bcb1786e9e2ee31a8

chadversary/deqp,KhronosGroup/VK-GL-CTS,geekboxzone/mmallow_external_deqp,KhronosGroup/Vulkan-CTS,KhronosGroup/VK-GL-CTS,geekboxzone/mmallow_external_deqp,googlestadia/VK-GL-CTS,KhronosGroup/Vulkan-CTS,chadversary/deqp,googlestadia/VK-GL-CTS,KhronosGroup/Vulkan-CTS,KhronosGroup/Vulkan-CTS,googlestadia/VK-GL-CTS,geekboxzone/mmallow_external_deqp,geekboxzone/mmallow_external_deqp,googlestadia/VK-GL-CTS,chadversary/deqp,KhronosGroup/Vulkan-CTS,KhronosGroup/VK-GL-CTS,KhronosGroup/VK-GL-CTS,KhronosGroup/VK-GL-CTS,geekboxzone/mmallow_external_deqp,KhronosGroup/Vulkan-CTS,KhronosGroup/VK-GL-CTS,chadversary/deqp,googlestadia/VK-GL-CTS,googlestadia/VK-GL-CTS,chadversary/deqp,geekboxzone/mmallow_external_deqp,chadversary/deqp