Permission on tox node keys

src/freedombone-app-tox

         done
         echo ')' >> $TOX_BOOTSTRAP_CONFIG
     fi
+
+    if [ -f $rootdir/var/lib/tox-bootstrapd/keys ]; then
+        chmod 700 $rootdir/var/lib/tox-bootstrapd/keys
+    fi
 }
 
 function mesh_tox_avahi {