tdf#108852: Put signature infobar into the right frame

and thus avoid crash when user clicks 'show signatures' button
in a window where signature bar shouldn't even be

Change-Id: I5eba8d1ddd8c76dd10acedfa03d732df586748de
Reviewed-on: https://gerrit.libreoffice.org/39699
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Samuel Mehrbrodt <Samuel.Mehrbrodt@cib.de>
diff --git a/sfx2/source/doc/objserv.cxx b/sfx2/source/doc/objserv.cxx
index e890a04..856a22a 100644
--- a/sfx2/source/doc/objserv.cxx
+++ b/sfx2/source/doc/objserv.cxx
@@ -1008,7 +1008,7 @@ void SfxObjectShell::GetState_Impl(SfxItemSet &rSet)
            }
            case SID_SIGNATURE:
            {
                SfxViewFrame *pFrame = SfxViewFrame::Current();
                SfxViewFrame *pFrame = SfxViewFrame::GetFirst(this);
                if ( pFrame )
                {
                    SignatureState eState = GetDocumentSignatureState();