pptx: Fix logic for choosing Comparison layout

There was a mistake in the logic used to choose between the Comparison
and Two Content layouts: if one column contained only non-text (an image
or a table) and the other contained only text, the Comparison layout was
chosen instead of the desired Two Content layout.

This commit fixes that logic:

> If either column contains text followed by non-text, use Comparison.
  Otherwise, use Two Content.

It also adds a test asserting this behaviour.

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