exportdialog: don't double-set data

app/dialog/export/export.cpp

@@ -259,7 +259,7 @@ ExportDialog::ExportDialog(ViewerOutput *viewer_node, bool stills_only_mode, QWi
 
   // If the viewer already has cached params, use them
   if (!stills_only_mode_ && viewer_node_->GetLastUsedEncodingParams().IsValid()) {
-    SetParams(viewer_node_->GetLastUsedEncodingParams());
+    // This will automatically set the param data
     QtUtils::SetComboBoxData(preset_combobox_, kPresetLastUsed);
   } else {
     SetDefaults();