feat(inss): enable master server checking

lgsm/config-default/config-lgsm/inssserver/_default.cfg

@@ -132,7 +132,7 @@ steamcmdforcewindows="no"
 branch=""
 betapassword=""
 # Master Server | https://docs.linuxgsm.com/steamcmd/steam-master-server
-steammaster="false"
+steammaster="true"
 
 ## Stop Mode | https://docs.linuxgsm.com/features/stop-mode
 # 1: tmux kill