ipynb: fix bug in android workload notebook

wload is a Jankbench notebook not a dictionary. Let's use 10
seconds systrace for each iteration instead.
diff --git a/ipynb/android/Android_Workloads.ipynb b/ipynb/android/Android_Workloads.ipynb
index d57bde6..2b99359 100644
--- a/ipynb/android/Android_Workloads.ipynb
+++ b/ipynb/android/Android_Workloads.ipynb
@@ -354,7 +354,7 @@
     "    elif 'systrace' in collect:\n",
     "        # Start systrace\n",
     "        trace_file = os.path.join(exp_dir, 'trace.html')\n",
-    "        trace_cmd = SYSTRACE_CMD.format(DEVICE, trace_file, wload['duration'] * iterations)\n",
+    "        trace_cmd = SYSTRACE_CMD.format(DEVICE, trace_file, 10 * iterations)\n",
     "        logging.info('SysTrace: %s', trace_cmd)\n",
     "        systrace_output = pe.spawn(trace_cmd)\n",
     "    \n",