Changing SwiftShader to return:

    VK_SAMPLE_COUNT_1_BIT | VK_SAMPLE_COUNT_4_BIT for

for VkPhysicalDeviceLimits::sampledImageIntegerSampleCounts fixes two
tests that were failing with SwS.

This also fixes the expectations file for another test.

Bug: angleproject:4260
Bug: angleproject:4259
Bug: angleproject:3565
Change-Id: I698468ff8421b1c8556c8671b173e1cfde6b7f6e
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1999484Reviewed-by: Courtney Goeltzenleuchter <courtneygo@google.com>
Reviewed-by: Ian Elliott <ianelliott@google.com>
Commit-Queue: Ian Elliott <ianelliott@google.com>