Revert "fix: space around block md ext"

[nobkd]

Reverts #363

this part !comp && (I think), breaks code like the following:

[! img/controls.svg width=50px]

[! img/controls.svg width=50px]

[! img/controls.svg width=50px]

resulting in

<figure><img loading="lazy" width="50px" src="img/controls.svg"></figure>
<p>[! img/controls.svg width=50px]</p>
<figure><img loading="lazy" width="50px" src="img/controls.svg"></figure>

If the next md extension was nested, or the next line was no md extension, there would be no problem.

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I will check, if I find a solution, to prevent this issue after all, but for now, I leave this reverting PR open