Fix unit tests

PIALibraryTests/VPNTests.swift

@@ -17,7 +17,11 @@ class VPNTests: XCTestCase {
 
         Client.database = Client.Database(group: "group.com.privateinternetaccess")
         Client.providers.vpnProvider = MockVPNProvider()
-        Client.preferences.vpnDisconnectsOnSleep = true
+
+        let prefs = Client.preferences.editable()
+        prefs.vpnDisconnectsOnSleep = true
+        prefs.commit()
+
         Client.bootstrap()
     }