fix: undefined and null wrap prop values are rendered as undefined instead of true by default

[EvHaus]

Similar to #3149 and #3142, this PR fixes a bug introduced in this change. When a wrap value of undefined or null is passed to <View> components, the latest versions of react-pdf will treat it as false instead of true (which should be the default value).

Also adds tests for this function.

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[diegomura]

Is it correct that undefined was already returning true? I'm not sure about null though. That's a falsy value. Makes more sense to me to false for null than true

[EvHaus]

Is it correct that undefined was already returning true?

The current behaviour is:

1. <View /> is treated as true
2. <View wrap={undefined} /> is treated as false
3. <View wrap={null} /> is treated as false
4. <View wrap={false} /> is treated as false
5. <View wrap={true} /> is treated as false

I think 1, 4 and 5 make sense. But 2 and 3 are unexpected to me.

I'm not sure about null though. That's a falsy value. Makes more sense to me to false for null than true

I see where you're coming from however given that "no value" (case 1) and undefined (case 2) will evaluate to true I think having null evaluate to true is a more developer-friendly/consistent experience.

Let me know if you feel strongly about it and I'll make the PR change accordingly. Thanks @diegomura!