[featureRequest] remove switch with only one element without systemLanguage/requiredFeatures

[JoKalliauer]

Input

Text4CS.svg.txt

 <switch>
  <text font-family="Liberation Sans,Arial" font-size="8" transform="matrix(1.0056 0 0 1 -488.32 1166.6)">8 º</text>
 </switch>

Desired output

  <text font-family="Liberation Sans,Arial" font-size="8" transform="matrix(1.0056 0 0 1 -488.32 1166.6)">8 º</text>

Copyright

source: https://commons.wikimedia.org/wiki/File:India_roadway_map.svg

author: CC-by-sa PlaneMad/Wikimedia

License https://creativecommons.org/licenses/by-sa/3.0/