Rebaseline hairline images & remove suppression

expectations/gm/Test-Ubuntu12-ShuttleA-ATI5770-x86-Release/expected-results.json

 {
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     "no-comparison": null, 
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   }, 
   "expected-results": {
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       "allowed-digests": [
@@ skipping 6793 matching lines @@
       ], 
       "bugs": [
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       ], 
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       ], 
@@ skipping 4079 matching lines @@
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         ]
       ], 
       "bugs": [
         1578
       ], 
       "reviewed-by-human": false
     }
   }
 }