[gssdp] sniffer: Fix clearing of packet capture

[Jens Georg <jensgeorg src gnome org>]

commit 0e336b0bbb2425e33bbc8383b88933a651823e80
Author: Jens Georg <mail jensge org>
Date:   Fri Oct 26 21:20:46 2018 +0200

    sniffer: Fix clearing of packet capture

 tools/gssdp-device-sniffer.ui | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/tools/gssdp-device-sniffer.ui b/tools/gssdp-device-sniffer.ui
index 7644fc7..d5efb72 100644
--- a/tools/gssdp-device-sniffer.ui
+++ b/tools/gssdp-device-sniffer.ui
@@ -32,6 +32,7 @@
                         <property name="can_focus">False</property>
                         <property name="use_underline">True</property>
                         <property name="use_stock">True</property>
+                        <signal name="activate" handler="on_clear_packet_capture_activate" swapped="no"/>
                       </object>
                     </child>
                     <child>