min_length validation is checked on reset

If you have set a minimum length for the exposed fulltext filter, and the user enters less than that value, clicking on reset after receiving the "You must include at least one positive keyword with X characters or more." will retrigger the validation, causing an endless loop of error messages.

The include patch checks if the triggering element has the same value as the form reset element value and skips the rest of the validation at that point.