artiq.svg: clean up

* Remove several broken open paths that do not add visible geometry
  (AI/Inkscape residue)
* Ungroup a spurious group
* Convert two remaining objects from polygon to paths such that
  the file only contains paths. Increases compatibility with other tools
  (CAD, PCB layout, conversion tools)

doc/logo/artiq.svg

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@@ -82,9 +70,6 @@
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      id="path337"
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      inkscape:connector-curvature="0"
@@ -103,11 +88,11 @@
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@@ -116,12 +101,10 @@
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