[MM-52288] Oauth2 postgres migration issue (#23036)

* fixing migrations that caused some oauth2 issues

server/channels/db/migrations/postgres/000105_remove_tokens.up.sql

@@ -4,8 +4,7 @@ WITH oauthDelete AS (
 	DELETE FROM oauthaccessdata o
 	WHERE NOT EXISTS (
 		SELECT p.* FROM preferences p
-		WHERE o.clientid = p.name AND o.userid = p.userid AND p.category = 'oauth_app' 
-		and p.name IS NULL
+		WHERE o.clientid = p.name AND o.userid = p.userid AND p.category = 'oauth_app'
 	)
 	RETURNING o.token
 )