Improve fileshare monitoring job

[devzbysiu]

Changes:

• no API call for meshnet peers - it uses MachineMap now to get peers
• job reacts all the time (not only when it detects process state change) - this prevents the corner case of binding to port early and then enabling meshnet to open the port on firewall
• networker blocks fileshare for all attempts to add the rules (see netw.isFilesharePermitted) as long as the process is down
• job runs every second instead of 5s