Don't configure ssh if it isn't installed

src/freedombone-image-customise

@@ -246,7 +246,7 @@ following commands, then enter your details.
 }
 
 configure_ssh() {
-    if [[ $VARIANT == "mesh" || $VARIANT == "meshclient" || $VARIANT != "meshusb" ]]; then
+    if [[ $VARIANT == "mesh" || $VARIANT == "meshclient" || $VARIANT == "meshusb" ]]; then
         return
     fi