remove open backup folder link

https://anki.tenderapp.com/discussions/ankidesktop/35084-crash-while-trying-to-revert-to-a-backup

aqt/preferences.py

@@ -5,7 +5,7 @@
 import datetime, time
 from aqt.qt import *
 import anki.lang
-from aqt.utils import openFolder, openHelp, showInfo, askUser
+from aqt.utils import openHelp, showInfo, askUser
 import aqt
 from anki.lang import _
 
@@ -209,10 +209,6 @@ Not currently enabled; click the sync button in the main window to enable."""))
 
     def setupBackup(self):
         self.form.numBackups.setValue(self.prof['numBackups'])
-        self.form.openBackupFolder.linkActivated.connect(self.onOpenBackup)
-
-    def onOpenBackup(self):
-        openFolder(self.mw.pm.backupFolder())
 
     def updateBackup(self):
         self.prof['numBackups'] = self.form.numBackups.value()

designer/preferences.ui

@@ -426,7 +426,7 @@
        <item>
         <widget class="QLabel" name="openBackupFolder">
          <property name="text">
-          <string>&lt;a href=&quot;backups&quot;&gt;Open backup folder&lt;/a&gt;</string>
+          <string>You can restore backups via File&gt;Switch Profile.</string>
          </property>
         </widget>
        </item>