dmapper: remove last paragraph of footnotes

This is the same trick as with headers/footers: the footnote always ends
with an empty paragraph, but in Writer we need to remove this.

writerfilter/source/dmapper/DomainMapper_Impl.cxx

@@ -1335,6 +1335,7 @@ void DomainMapper_Impl::PushAnnotation()
 
 void DomainMapper_Impl::PopFootOrEndnote()
 {
+    RemoveLastParagraph();
     m_aTextAppendStack.pop();
 }