fix doubling search results in Search Result Panel

After fix local search in SFC POU in 163d3a8, search results tree assemble with "children" branches: results of search in actions anf transitions. Deleted code doubling this search results into one more separate branch, so it's useless.

.. Beremiz documentation master file

Beremiz's documentation
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Contents:

.. toctree::
   :maxdepth: 2

   overview
   manual/index
   standards