Cleanup of switch case flowRoot in svg endelement

We don't need this switch case due the fact we already check it
before the switch itself. I did introduce this in commit
5bd241b9 but it is redundant.

Change-Id: I24e8c946ef8b8f094daa248c701772e54790c9d1
Reviewed-on: https://gerrit.libreoffice.org/10317Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>
Tested-by: Tomaž Vajngerl <quikee@gmail.com>

svgio/source/svgreader/svgdocumenthandler.cxx

@@ -475,13 +475,6 @@ namespace svgio
                         }
                         break;
                     }
-
-                    case SVGTokenFlowRoot:
-                    {
-                        bSkip = false;
-                        break;
-                    }
-
                     default:
                     {
                         /// invalid token, ignore