bug(fxFlex): flex basis should only be set to width value when wrapping

[CaerusKaru]

Currently the flex-basis is set to the value of the width when present as a fix for wrapping in older versions of Safari. However, this throws off ordinary flex values when not wrapping (and is not needed when not wrapping).

Need a partial revert of the recent PR to fix this, with a patch that detects wrapping

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