Fix flow for Page optional props (base template)

[AuroreM]

PR related to this issue https://github.com/bamlab/generator-rn-toolbox/issues/149

[4ian]

@Almouro What is the best practise for the commits name? Is there documentation/some hint about this somewhere? ;)

[Almouro]

Yes, here but it's not really clear enough. It would be better to have this in the pull request template :) I'm going to add this right now.

But yeah, @AuroreM, your commit should be starting with fix:

[Minishlink]

Or maybe activate back Squash and merge so that you can rename directly (no rework)?

[tychota]

@AuroreM : ping