tiny tag editor: fix file edition in local browser

src/tiny_tag_editor.cpp

@@ -169,6 +169,9 @@ void TinyTagEditor::mouseButtonPressed(MEVENT me)
 
 void TinyTagEditor::SetEdited(const MPD::Song &s)
 {
+	if (auto ms = dynamic_cast<const MPD::MutableSong *>(&s))
+		itsEdited = *ms;
+	else
 		itsEdited = s;
 }