Qt: Fix statusbar messages

Commit 3c8c392 (https://code.wireshark.org/review/c/35071/) introduced
a regression where the messages in the status bar are no longer visible.
This change corrects that.

Change-Id: I23059a5013a65efe73454fc798048630a9e66792
Reviewed-on: https://code.wireshark.org/review/35085
Petri-Dish: Roland Knall <rknall@gmail.com>
Tested-by: Petri Dish Buildbot
Reviewed-by: Roland Knall <rknall@gmail.com>

ui/qt/main_status_bar.cpp

@@ -434,6 +434,9 @@ void MainStatusBar::showCaptureStatistics()
     if (packets_str.isEmpty()) {
         packets_str = tr("No Packets");
     }
+
+    popGenericStatus(STATUS_CTX_MAIN);
+    pushGenericStatus(STATUS_CTX_MAIN, packets_str);
 }
 
 void MainStatusBar::updateCaptureStatistics(capture_session *cap_session)