Fix unix socket address generation on linux systems

Author: codrod

extension/script/common/socket.lua

@@ -5,7 +5,7 @@ local function parseAddress(param)
     local mode, address = param:match "^([a-z]+):(.*)"
     if address:sub(1,1) == '@' then
         local fs = require "bee.filesystem"
-        address = address:gsub("%$tmp", fs.temp_directory_path():string():gsub("([/\\])$", ""))
+        address = address:gsub("%$tmp", (fs.temp_directory_path():string():gsub("([/\\])$", "")))
         return {
             protocol = 'unix',
             address = address:sub(2),