Inconsequential typo in common\rules.cpp

[Knightly]

Pretty insignificant, but it caught my eye while looking over the rules code.

_log(RULES__ERROR, "Fauled to create rule set in the database: %s: %s", query,errbuf);

should be:
_log(RULES__ERROR, "Failed to create rule set in the database: %s: %s", query,errbuf);