Support for counting screen sessions running with extra parameters

Closed Johann Dreo requested to merge github/fork/yannack/fix/screen-count-regex into develop

Created by: yannack

In some cases (multi user enabled in screen for example), the count of detached screen sessions was incorrect. The command to locate these has been improved using a more tolerant regex, which also makes sure the "Detached" word appears inside a parenthesis (so it's not an attached screen to a machine called Detach for example).

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