added /usr/share/lug-helper path for lutris json for easier packaging

lug-helper.sh

@@ -151,8 +151,13 @@ else
     lug_logo="info"
 fi
 
-# Lutris install script
-install_script="$helper_dir/lug-lutris-install.json"
+# Use Lutris install script installed by a packaged version of this script if available
+# Otherwise, default to the json in the same directory
+if [ -f "/usr/share/lug-helper/lug-lutris-install.json" ]; then
+    install_script="/usr/share/lug-helper/lug-lutris-install.json"
+else
+    install_script="$helper_dir/lug-lutris-install.json"
+fi
 
 # Github repo and script version info
 repo="starcitizen-lug/lug-helper"