Fix issue with TextField hint is missing when using floatingPlaceholder

[ethanshar]

Description

Fix an issue where TextField hint prop didn't show because it conflicted with the floating placeholder.
Now it should work when the users pass floatingPlaceholder only if they also pass floatOnFocus

These examples can show the different variations

<Incubator.TextField placeholder="Placeholder"/>
<Incubator.TextField useCustomTheme floatingPlaceholder={false} placeholder="Placeholder" hint="Helper"/>
<Incubator.TextField useCustomTheme floatingPlaceholder _floatOnFocus placeholder="Placeholder" hint="Helper"/>
<Incubator.TextField useCustomTheme floatingPlaceholder floatOnFocus placeholder="Placeholder" hint="Helper"/>

Changelog

Fix issue with TextField hint is missing when using floatingPlaceholder (still requires to pass floatOnFocus)