Fix a Windows OS version bug in gpu drive bug list.

BUG=817286
TEST=perf bot falls back to D3D9
R=geofflang@chromium.org

Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: Icd19277b6074178be8e26312be20ec02dd0b01c0
Reviewed-on: https://chromium-review.googlesource.com/961489Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Zhenyao Mo <zmo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543080}

gpu/config/gpu_driver_bug_list.json

@@ -2816,7 +2816,7 @@
         "type": "win",
         "version": {
           "op": "=",
-          "value": "7.0"
+          "value": "6.1"
         }
       },
       "vendor_id": "0xffff",