Add render format to context of event PLUGIN_STRUCT_RENDER_AGGREGATION_TABLE (#575)

This was missing from the event context when the event was introduced.
To use the format/mode in the event let's pass it in the context.

Signed-off-by: Frieder Schrempf <dev@fris.de>

Author: fschrempf

meta/AggregationTable.php

@@ -120,6 +120,7 @@ public function render()
         $rendercontext = array(
             'table' => $this,
             'renderer' => $this->renderer,
+            'format' => $this->mode,
             'search' => $this->searchConfig,
             'columns' => $this->columns,
             'data' => $this->result