Rebaseline hairline images & remove suppression

expectations/gm/Test-Mac10.6-MacMini4.1-GeForce320M-x86_64-Debug/expected-results.json

 {
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       "allowed-digests": [
@@ skipping 9209 matching lines @@
       ], 
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@@ skipping 5629 matching lines @@
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         ]
       ], 
       "bugs": [
         1578
       ], 
       "reviewed-by-human": false
     }
   }
 }