Simplify formatting string in advisor

We don't need to evaluate whole printf, it's enough to evalue the
parameter.

Signed-off-by: Michal Čihař <michal@cihar.com>
Remove no longer used ignoreUntil parameter of PMA_Advisor::ruleExprEvaluate

Signed-off-by: Michal Čihař <michal@cihar.com>