Update startup.sh.vtl

Author: fvarrui

src/main/resources/linux/startup.sh.vtl

@@ -1,6 +1,6 @@
 #!/bin/sh
 # GNU/Linux startup script generated by JavaPackager Maven Plugin
-SCRIPTPATH=`cd "$(dirname "$0")" ; pwd`
+SCRIPTPATH=$(dirname $(readlink -e "$0"))
 #if($info.bundleJre)
 JAVA=$SCRIPTPATH/jre/bin/java
 #else