fix importing of v2 colpkg files

aqt/importing.py

@@ -8,6 +8,7 @@ import traceback
 import zipfile
 import json
 import unicodedata
+import shutil
 
 from aqt.qt import *
 import anki.importing as importing
@@ -399,7 +400,9 @@ def _replaceWithApkg(mw, file, backup):
         colname = "collection.anki2"
 
     try:
-        z.extract(colname, mw.pm.profileFolder())
+        with z.open(colname) as source, \
+                open(mw.pm.collectionPath(), "wb") as target:
+            shutil.copyfileobj(source, target)
     except:
         mw.progress.finish()
         showWarning(_("The provided file is not a valid .apkg file."))