Revert "Patch PyQt6 QUrl flag behavior for Python 3.11"

This reverts commit 14c1593de2abd9f24a223805a4740d8d9fd93622.
Fixed in Python 3.11b2: https://github.com/python/cpython/pull/93302

qutebrowser/misc/earlyinit.py

@@ -30,7 +30,6 @@ except ImportError:
     hunter = None
 
 import sys
-import enum
 import faulthandler
 import traceback
 import signal
@@ -271,13 +270,6 @@ def configure_pyqt():
         # FIXME:qt6 solve this in qutebrowser/qt/sip.py equivalent?
         pass
 
-    # WORKAROUND for
-    # https://www.riverbankcomputing.com/pipermail/pyqt/2022-May/044668.html
-    if hasattr(enum, "FlagBoundary"):  # Python 3.11
-        from qutebrowser.qt.core import QUrl
-        # pylint: disable-next=protected-access
-        QUrl.UrlFormattingOption._boundary_ = enum.FlagBoundary.KEEP
-
 
 def init_log(args):
     """Initialize logging.

scripts/dev/run_vulture.py

@@ -91,7 +91,6 @@ def whitelist_generator():  # noqa: C901
     yield 'PaintContext.clip'  # from completiondelegate.py
     yield 'logging.LogRecord.log_color'  # from logging.py
     yield 'scripts.utils.use_color'  # from asciidoc2html.py
-    yield 'QUrl.UrlFormattingOption._boundary_'
     for attr in ['pyeval_output', 'log_clipboard', 'fake_clipboard']:
         yield 'qutebrowser.misc.utilcmds.' + attr