we no longer directly modify schema_version in migrations

sql/mysql/migrations/148.sql

@@ -1,3 +1,2 @@
 alter table ttrss_feeds change auth_pass auth_pass text not null;
 
-update ttrss_version set schema_version = 148;

sql/pgsql/migrations/148.sql

@@ -3,5 +3,3 @@ alter table ttrss_feeds add column auth_pass text;
 update ttrss_feeds set auth_pass = auth_pass_old;
 alter table ttrss_feeds alter column auth_pass set not null;
 alter table ttrss_feeds drop column auth_pass_old;
-
-update ttrss_version set schema_version = 148;