Revert "stdlib: close connection on Tx commit or rollback that doesn't end Tx"

This reverts commit 2583134306.

This fix should actually be on the main Tx implementation.

stdlib/sql.go

@@ -716,23 +716,9 @@ type wrapTx struct {
 	tx  pgx.Tx
 }
 
-func (wtx wrapTx) Commit() error {
+func (wtx wrapTx) Commit() error { return wtx.tx.Commit(wtx.ctx) }
-	pgxConn := wtx.tx.Conn()
-	err := wtx.tx.Commit(wtx.ctx)
-	if err != nil && pgxConn.PgConn().TxStatus() != 'I' {
-		_ = pgxConn.Close(wtx.ctx) // already have error to return
-	}
-	return err
-}
 
-func (wtx wrapTx) Rollback() error {
+func (wtx wrapTx) Rollback() error { return wtx.tx.Rollback(wtx.ctx) }
-	pgxConn := wtx.tx.Conn()
-	err := wtx.tx.Rollback(wtx.ctx)
-	if err != nil && pgxConn.PgConn().TxStatus() != 'I' {
-		_ = pgxConn.Close(wtx.ctx) // already have error to return
-	}
-	return err
-}
 
 type fakeTx struct{}