Updated visual regression assertions (#243) #1020

Job	Run time
Test (packages/ember-container-query)	28s
Lint (docs-app)	33s
Test (test-app)	45s
Build (docs-app)	43s
Lint (packages/ember-container-query)	28s
Test compatibility (ember-lts-4.4)	1m 18s
Lint (test-app)	29s
Test compatibility (ember-lts-4.8)	52s
Test compatibility (ember-lts-4.12)	1m 6s
Test compatibility (ember-lts-5.4)	52s
Test compatibility (ember-lts-5.8)	51s
Test compatibility (ember-release)	1m 6s
Test compatibility (ember-beta)	1m 2s
Test compatibility (ember-canary)	57s
Test compatibility (embroider-safe)	1m 6s
Test compatibility (embroider-optimized)	1m 6s
Test (docs-app) (w1-h1)	51s
Test (docs-app) (w2-h1)	1m 2s
Test (docs-app) (w3-h1)	1m 23s
Test (docs-app) (w1-h2)	55s
Test (docs-app) (w2-h2)	54s
Test (docs-app) (w3-h2)	52s
Test (docs-app) (w1-h3)	57s
Test (docs-app) (w2-h3)	52s
Test (docs-app) (w3-h3)	59s
	22m 27s

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