Update startup.sh.vtl

Author: fvarrui

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

@@ -2,7 +2,7 @@
 #!/usr/bin/env bash
 # GNU/Linux startup script generated by JavaPackager plugin
 
-SCRIPTPATH=$(dirname $(readlink -e "$0"))
+SCRIPTPATH=$(dirname "$(readlink -e "$0")")
 
 #if ($info.bundleJre)
 JAVA="$SCRIPTPATH/${info.jreDirectoryName}/bin/java"