Use correct token

Author: berland

.github/workflows/test_screenshots.yml

@@ -59,7 +59,7 @@ jobs:
       with:
         repository: equinor/ert-testdata
         ref: screenshots
-        token: ${{ secrets.ERTOMATIC_TOKEN }}
+        token: ${{ secrets.ERTOMATIC_ERT_TESTDATA_TOKEN }}
         path: ert-testdata
 
     - name: Copy updated screenshots into ert-testdata