GUI -- topo - fix incorrect function reference.

Change-Id: I937808577ceed5c43afe840fb543af3a6c2401fd
(cherry picked from commit 356da766)

@@ -200,7 +200,7 @@
 
         } else if (tps.summaryVisible()) {
             // else if the Summary Panel is visible, hide it
-            tps.hideSummaryPanel();
+            tps.hideSummary();
         }
     }