Inline nodes in our layout tree have a position, so let's show it. By
centralizing the logic for this, block nodes now lose their redundant
'content-size' dump info which is already part of the box model dump.
This condition was included to implement flex containers with auto
height, but it actually can reset the definitive height to 0 for inline
blocks with only replaced elements such as an SVG. Removing the
condition does not break any in-tree test, so let's improve the
situation on the SVG side of things for now.
