Remove verbose-system-logs on iOS perf tests (#142739)

https://github.com/flutter/flutter/issues/129836 was closed in October.

dev/devicelab/lib/tasks/perf_tests.dart

diff --git a/dev/devicelab/lib/tasks/perf_tests.dart b/dev/devicelab/lib/tasks/perf_tests.dart
index b5ab1f6..ad4561b 100644
--- a/dev/devicelab/lib/tasks/perf_tests.dart
+++ b/dev/devicelab/lib/tasks/perf_tests.dart
@@ -999,9 +999,6 @@
             '--verbose',
             '--profile',
             '--trace-startup',
-            // TODO(vashworth): Remove once done debugging https://github.com/flutter/flutter/issues/129836
-            if (device is IosDevice)
-              '--verbose-system-logs',
             '--target=$target',
             '-d',
             device.deviceId,