all: Add untrusted folders behind feature flag (ref #62) (#7055)

lib/api/mocked_config_test.go

@@ -114,6 +114,10 @@ func (c *mockedConfig) RemoveFolder(id string) (config.Waiter, error) {
 	return noopWaiter{}, nil
 }
 
+func (c *mockedConfig) FolderPasswords(device protocol.DeviceID) map[string]string {
+	return nil
+}
+
 func (c *mockedConfig) Device(id protocol.DeviceID) (config.DeviceConfiguration, bool) {
 	return config.DeviceConfiguration{}, false
 }