Incorrect WEB data processing in case of a failed scenario step

If a WEB step fails (cannot match page or incorrect response code), we save speed and response time as 0. It is incorrect. We must save correct data and also display correct data for the step in Monitoring->WEB, and also have them correct in history. Now zeroes are displayed there for the failed step.

Another small improvement, when we edit scenario details, please reset next check time, so the WEB scenario will be executed immediately.