Modify the logic that makes the reclaim button sensitive (#911793).

This dialog now serves two different purposes:  (1) You do not have enough
free space, and need to make some before you can continue to install.  (2) You
do have enough free space but want to free up additional space.

Because the button is labeled "Reclaim space", we only want to allow clicking
on it if you have chosen some destructive action.  Buttons should be labeled
with what they do, after all.  However, we also want to take into account any
free space that may already exist on disk when considering whether you have
enough to continue.

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