sqlite: do not enable stat3 support

It's buggy with 3.8.1, 3.8.2 and 3.8.3.

See this bug for details:
https://www.sqlite.org/src/info/4c86b126f2

Further, it violates the query planner stability guarantee:
https://sqlite.org/queryplanner-ng.html#qpstab
https://sqlite.org/compile.html

Closes #26592.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
sqlite: drop redundant comment