ipc: Fix missing import.

qutebrowser/app.py

@@ -25,7 +25,6 @@ import subprocess
 import configparser
 import functools
 import json
-import time
 import shutil
 import tempfile
 import atexit

qutebrowser/misc/ipc.py

@@ -20,6 +20,7 @@
 """Utilities for IPC with existing instances."""
 
 import os
+import time
 import json
 import getpass
 import binascii