Update entry of 'Android Go' builder in perf_data_generator.py

TBR=perezju@chromium.org
NOTRY=true # test by PRESUBMIT

Bug: 863767
Change-Id: I210c158140e015f0a15ba9d34945fcda8f394d43
Reviewed-on: https://chromium-review.googlesource.com/1140917Reviewed-by: Ned Nguyen <nednguyen@google.com>
Commit-Queue: Ned Nguyen <nednguyen@google.com>
Cr-Commit-Position: refs/heads/master@{#575761}

tools/perf/core/perf_data_generator.py

@@ -128,9 +128,9 @@ NEW_PERF_RECIPE_FYI_TESTERS = {
           'isolate': 'performance_test_suite',
           'extra_args': [
             '--run-ref-build',
-            '--test-shard-map-filename=android_go_14_shard_map.json',
+            '--test-shard-map-filename=android_go_shard_map.json',
           ],
-          'num_shards': 14
+          'num_shards': 19
         }
       ],
       'platform': 'android',