Fix incorrect behavior when adding an autoincrement column to a Postg… #1920

Job	Run time
Build `sea-query`	1m 18s
Build `sea-query-postgres`	1m 23s
Clippy	1m 50s
Build `sea-query-binder` (async-std, rustls)	3m 56s
Build `sea-query-rusqlite`	1m 10s
Rustfmt	17s
Derive Tests	56s
Unit Test	3m 9s
Any	1m 43s
PostgreSQL (14.4, postgres)	1m 16s
PostgreSQL (14.4, sqlx_postgres)	1m 46s
PostgreSQL (13.7, postgres)	1m 16s
PostgreSQL (13.7, sqlx_postgres)	2m 3s
PostgreSQL (12.11, postgres)	1m 13s
PostgreSQL (12.11, sqlx_postgres)	1m 56s
MySQL (8, sqlx_mysql)	1m 51s
MySQL (5.7, sqlx_mysql)	1m 47s
MariaDB (10.6, sqlx_mysql)	2m 1s
SQLite (rusqlite)	40s
SQLite (sqlx_sqlite)	1m 25s
	32m 56s

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