Revert "fdo#74743 avoid infinite loop when gathering "svg" element styles"

This reverts commit 3b7472b284131c09d91b69f26d5d26d54648f939.
Commit 0879a639bc7c734f0847f74b965809f9107b3195 didn't
revert all changes, so we ran into problems getting the
css style correctly.

Conflicts:
	svgio/source/svgreader/svgstyleattributes.cxx
	svgio/source/svgreader/svgsvgnode.cxx

Change-Id: I4d17c6d599482de005c009638d03ca851491f700
Reviewed-on: https://gerrit.libreoffice.org/10455
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>
Tested-by: Tomaž Vajngerl <quikee@gmail.com>