Drop certificateerror.create factory function

Now that the two implementations are in the same class, there's no need
for the indirection anymore.

Follow-up to 647b74197a.

qutebrowser/browser/webengine/certificateerror.py

@@ -79,8 +79,3 @@ class CertificateErrorWrapper(usertypes.AbstractCertificateErrorWrapper):
         # WORKAROUND for https://www.riverbankcomputing.com/pipermail/pyqt/2022-April/044585.html
         # (PyQt 5.15.6, 6.2.3, 6.3.0)
         raise usertypes.UndeferrableError("PyQt bug")
-
-
-def create(error: QWebEngineCertificateError) -> CertificateErrorWrapper:
-    """Factory function picking the right class based on Qt version."""
-    return CertificateErrorWrapper(error)

qutebrowser/browser/webengine/webview.py

@@ -214,7 +214,7 @@ class WebEnginePage(QWebEnginePage):
     @pyqtSlot(QWebEngineCertificateError)
     def _handle_certificate_error(self, qt_error):
         """Handle certificate errors coming from Qt."""
-        error = certificateerror.create(qt_error)
+        error = certificateerror.CertificateErrorWrapper(qt_error)
         self.certificate_error.emit(error)
         # Right now, we never defer accepting, due to a PyQt bug
         return error.certificate_was_accepted()