Make batman script executable

src/freedombone

   echo '    ;;' >> $batman_script
   echo 'esac' >> $batman_script
   echo 'exit 0' >> $batman_script
+  chmod +x $batman_script
 
   echo '[Unit]' > /etc/systemd/system/batman.service
   echo 'Description=B.A.T.M.A.N. Advanced' >> /etc/systemd/system/batman.service