Fix args generation of run_telemetry_as_googletest.py

Change-Id: I9e2e1be12907bc93a2e2b9f60a1a406878b4c7e6
BUG: chromium:533481
Reviewed-on: https://chromium-review.googlesource.com/1114259Reviewed-by: Stephen Martinis <martiniss@chromium.org>
Commit-Queue: Ned Nguyen <nednguyen@google.com>
Cr-Commit-Position: refs/heads/master@{#570271}

testing/scripts/run_telemetry_as_googletest.py

@@ -66,7 +66,7 @@ def main():
     # This harness takes the test names to run as the first arguments.
     # The first argument of rest_args is the script to run, so insert
     # the test names after that.
-    rest_args = ([rest_args[0]] + filter_list + '--exact-test-filter' +
+    rest_args = ([rest_args[0]] + filter_list + ['--exact-test-filter'] +
                  rest_args[1:])
 
   # Compatibility with gtest-based sharding.