sugarsync: fix initial connection after config re-arrangement - Fixes #5525

In this commit the config system was re-arranged

    94dbfa4ea fs: change Config callback into state based callback #3455

This passed the password as a temporary config parameter but forgot to
reveal it in the API call.

backend/sugarsync/sugarsync.go

@@ -105,7 +105,7 @@ func init() {
 
 				authRequest := api.AppAuthorization{
 					Username:         username,
-					Password:         password,
+					Password:         obscure.MustReveal(password),
 					Application:      withDefault(opt.AppID, appID),
 					AccessKeyID:      withDefault(opt.AccessKeyID, accessKeyID),
 					PrivateAccessKey: withDefault(opt.PrivateAccessKey, obscure.MustReveal(encryptedPrivateAccessKey)),