[WARP] Fix relocatable region selection failing to fallback to section collection

Previously we only selected relocatable regions from the list of sections, now that we use the segment list we need a way to fallback to the
section list of the segment information is problematic (e.g. based at zero), that fallback has not been triggering as there is a segment for the synthetic sections.

Now when a user opens a firmware with only a single zero based segment it should fallback to the sections _and_ alert the user that they should fill out the section map (since that job is left to the user)

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