Rebaseline hairline images & remove suppression

expectations/gm/Test-Win7-ShuttleA-HD2000-x86-Release-DirectWrite/expected-results.json

 {
   "actual-results": {
     "failed": null, 
     "failure-ignored": null, 
     "no-comparison": null, 
     "succeeded": null
   }, 
   "expected-results": {
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       "allowed-digests": [
@@ skipping 6845 matching lines @@
       ], 
       "bugs": [
         1578
       ], 
       "reviewed-by-human": false
     }, 
     "hairlines_565.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
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+          17024602512928277966
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       ]
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       "allowed-digests": [
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       "allowed-digests": [
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           "bitmap-64bitMD5", 
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         ]
       ], 
@@ skipping 4085 matching lines @@
           13996013494185391731
         ]
       ], 
       "bugs": [
         1578
       ], 
       "reviewed-by-human": false
     }
   }
 }