Daemon - use jack_wait to detect jack

Author: lilyinstarlight

app/server/ruby/bin/daemon.rb

@@ -614,7 +614,7 @@ def run_pre_start_commands
         case Util.os
         when :linux, :raspberry
           #Start Jack if not already running
-          if `ps cax | grep jackd`.split(" ").first.nil?
+          if `jack_wait -c`.include? 'not running'
             #Jack not running - start a new instance
             Util.log "Jackd not running on system. Starting..."
             @jack_booter = JackBooter.new