gradtext also needed rebaselining from the gamma change

expectations/gm/Test-Win7-ShuttleA-HD2000-x86_64-Release/expected-results.json

 {
   "actual-results": {
     "failed": null, 
     "failure-ignored": null, 
     "no-comparison": null, 
     "succeeded": null
   }, 
   "expected-results": {
     "3x3bitmaprect_565.png": {
       "allowed-digests": [
@@ skipping 7599 matching lines @@
           5358977218148623651
         ]
       ], 
       "ignore-failure": false, 
       "reviewed-by-human": true
     }, 
     "gradtext_8888.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
-          18046380690276657173
+          1883617362438967528
         ]
       ], 
       "ignore-failure": false, 
       "reviewed-by-human": true
     }, 
     "gradtext_gpu.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
-          14241394273706423946
+          9833133577951959237
         ]
       ], 
       "ignore-failure": false, 
       "reviewed-by-human": true
     }, 
     "gradtext_pdf-poppler.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           15531712043266648101
@@ skipping 5137 matching lines @@
           14019814087375927425
         ]
       ], 
       "bugs": [
         1578
       ], 
       "reviewed-by-human": false
     }
   }
 }