Fix colorama log issues on Windows when frozen.

With the new version of colorlog, colorama.init() gets called when opening
colorlog, which then lead to sys.stderr not being None anymore (but a wrapped
"None"), which lead to an exception when we checked isatty().

We now just unwrap these again.

qutebrowser/utils/log.py

@@ -36,6 +36,11 @@ try:
     from colorlog import ColoredFormatter
 except ImportError:
     ColoredFormatter = None
+else:
+    # colorlog calls colorama.init() which breaks our sys.stdout/sys.stderr if
+    # they are None.
+    sys.stderr = sys.__stderr__
+    sys.stdout = sys.__stdout__
 try:
     # pylint: disable=import-error
     import colorama