[usdImagingGL] fix thresholds for testUsdImagingGLPurpose #1827
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Description of Change(s)
Currently, testUsdImagingGLPurpose relies solely on perceptual diff,
which fails to detect a change between world_0.png (which shows a
sphere) and world_1.png (which is empty). Changing to a reasonable
default for pixel difference (-fail .1, -failpercent 10) which can
successfully distinguish the two images.
Fixes Issue(s)
testUsdImagingGLPurpose fails to detect any changes when purpose is altered
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