gradtext also needed rebaselining from the gamma change

expectations/gm/Test-Win8-ShuttleA-HD7770-x86_64-Release/expected-results.json

 {
   "expected-results": {
     "3x3bitmaprect_565.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           12831071530564277917
         ]
       ], 
       "bugs": [
@@ skipping 7897 matching lines @@
           "bitmap-64bitMD5", 
           5358977218148623651
         ]
       ], 
       "reviewed-by-human": true
     }, 
     "gradtext_8888.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
-          18046380690276657173
+          1883617362438967528
         ]
       ], 
       "reviewed-by-human": true
     }, 
     "gradtext_gpu.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
-          14175207199653073347
+          9352626230764939481
         ]
       ], 
       "reviewed-by-human": true
     }, 
     "gradtext_pdf-poppler.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           15531712043266648101
         ]
@@ skipping 5221 matching lines @@
           14019814087375927425
         ]
       ], 
       "bugs": [
         1935
       ], 
       "reviewed-by-human": false
     }
   }
 }