Check_MK Werk 6850: Fixed broken ruleset search reset function

ID: 6850 Title: Fixed broken ruleset search reset function Component: WATO Level: 1 Class: Bug fix Version: 1.6.0i1 The reset functionality of the ruleset search was not working at all. It always resulted in an exception like: "AttributeError: 'ModeRuleSearch' object has no attribute 'search_options'"