Remove some results from int4-not-representable.out

This is due to the changes made to int4.sql.

< SELECT dsqrt(float8 '64') AS eight;
<  eight
< -------
<      8
< (1 row)
<
< SELECT |/float8 '64' AS eight;
<  eight
< -------
<      8
< (1 row)
<
< SELECT ||/float8 '27' AS three;
<  three
< -------
<      3
< (1 row)
<