fix(forge): improved tracking and use of Forge run.sh

Fixes #1260

scripts/start-finalExec

@@ -323,10 +323,10 @@ EOF
   else
     exec mc-server-runner "${mcServerRunnerArgs[@]}" "${finalArgs[@]}"
   fi
-elif [[ -x run.sh ]]; then
+elif [[ $SERVER =~ run.sh ]]; then
   log "Using Forge supplied run.sh script..."
   echo $JVM_XX_OPTS $JVM_OPTS $expandedDOpts > user_jvm_args.txt
-  exec mc-server-runner "${mcServerRunnerArgs[@]}" --shell bash run.sh
+  exec mc-server-runner "${mcServerRunnerArgs[@]}" --shell bash "${SERVER}"
 else
   # If we have a bootstrap.txt file... feed that in to the server stdin
   if [ -f /data/bootstrap.txt ]; then