Log exception through logging system

The default `sys.excepthook` (also available as `sys.__excepthook__` for
future reference) formats an exception and prints it to stderr. This
eventually shows up in the Android logging system through
pythonforandroid's stderr to Log converter, but that suffers all the
same problems that `AndroidLogHandler` addresses. Furthermore, since the
exception is sent directly to stderr, it doesn't get recorded in the
`kolibri.txt` file through its logging handler. Recording it with
`logging.critical` means it goes to both places with proper formatting
and priority.

src/kolibri_android/globals.py

@@ -1,7 +1,7 @@
+import logging
 import os
 import sys
 import traceback
-from functools import partial
 from logging.config import dictConfig
 from pathlib import Path
 
@@ -11,7 +11,6 @@
 from .android_utils import get_log_root
 from .android_utils import get_logging_config
 
-
 SCRIPT_PATH = Path(__file__).absolute().parent.parent
 
 FirebaseCrashlytics = autoclass("com.google.firebase.crashlytics.FirebaseCrashlytics")
@@ -32,12 +31,11 @@ def initialize():
     sys.path.append(SCRIPT_PATH.joinpath("kolibri", "dist").as_posix())
     sys.path.append(SCRIPT_PATH.joinpath("extra-packages").as_posix())
 
-    sys.excepthook = partial(log_exception, default_excepthook=sys.excepthook)
+    sys.excepthook = log_exception
 
 
-def log_exception(type, value, tb, default_excepthook=None):
-    if callable(default_excepthook):
-        default_excepthook(type, value, tb)
+def log_exception(type, value, tb):
+    logging.critical(str(value), exc_info=(type, value, tb))
     FirebaseCrashlytics.getInstance().recordException(
         PythonException(Arrays.toString(traceback.format_exception(type, value, tb)))
     )