gradtext also needed rebaselining from the gamma change

expectations/gm/Test-Mac10.6-MacMini4.1-GeForce320M-x86-Release/expected-results.json

 {
   "actual-results": {
     "failed": null, 
     "failure-ignored": null, 
     "no-comparison": null, 
     "succeeded": null
   }, 
   "expected-results": {
     "3x3bitmaprect_565.png": {
       "allowed-digests": [
@@ skipping 9128 matching lines @@
           "bitmap-64bitMD5", 
           273709740124546640
         ]
       ], 
       "ignore-failure": false
     }, 
     "gradtext_pdf-mac.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
-          9803122300416240866
+          7961471823724588641
         ]
       ], 
-      "bugs": [
-        476
-      ], 
       "ignore-failure": true, 
-      "reviewed-by-human": false
+      "reviewed-by-human": true
     }, 
     "hairlines_565.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           9293293797458777202
         ]
       ]
     }, 
     "hairlines_8888.png": {
@@ skipping 6221 matching lines @@
           7829854837061118142
         ]
       ], 
       "bugs": [
         1578
       ], 
       "reviewed-by-human": false
     }
   }
 }