build_telemetry: Fix arg parsing

`nargs=1` makes `args.status` to an array.

Fixed: 354726696
Change-Id: I219ea23a65bc2a960a69ef07c206e909348d536e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/5732736
Auto-Submit: Junji Watanabe <jwata@google.com>
Reviewed-by: Fumitoshi Ukai <ukai@google.com>
Commit-Queue: Junji Watanabe <jwata@google.com>

build_telemetry.py

@@ -162,8 +162,8 @@ def enabled():
 
 
 def main():
-    parser = argparse.ArgumentParser(prog="Build Telemetry util")
-    parser.add_argument('status', nargs=1, choices=['opt-in', 'opt-out'])
+    parser = argparse.ArgumentParser(prog="build_telemetry")
+    parser.add_argument('status', choices=['opt-in', 'opt-out'])
     args = parser.parse_args()
 
     cfg = load_config()