Rebaseline hairline images & remove suppression

expectations/gm/Test-Ubuntu12-ShuttleA-ATI5770-x86_64-Debug/expected-results.json

 {
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   "expected-results": {
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       "allowed-digests": [
@@ skipping 6793 matching lines @@
       ], 
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@@ skipping 4080 matching lines @@
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       ], 
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       "reviewed-by-human": false
     }
   }
 }