Fix build: incorrect revertion svgio

Incorrect revertion in commit 3d3401a6

Change-Id: If4abac2670b083ebbc75c2fe06ae9e100072ef00
Reviewed-on: https://gerrit.libreoffice.org/10466Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

svgio/source/svgreader/svgstyleattributes.cxx

@@ -208,7 +208,7 @@ namespace svgio
                 return getCssStyleParent();
             }
 
-            if(mrOwner.getParent())
+            if(mrOwner.supportsParentStyle() && mrOwner.getParent())
             {
                 return mrOwner.getParent()->getSvgStyleAttributes();
             }