locker : make fingerprint sensor signals count as activity

This causes the locker widgets to pop out when something happens with fprintd,
wether successful or not.

Author: AKArien

src/locker/plugin/fingerprint.cpp

@@ -199,6 +199,12 @@ void WayfireLockerFingerprintPlugin::start_fingerprint_scanning()
             return; // Skip close-down messages
         }
 
+        // count this as activity and show the widgets if hidden
+        for (auto pair : WayfireLockerApp::get().window_list)
+        {
+            pair.second->window_activity();
+        }
+
         if (signal_name == "VerifyStatus")
         {
             Glib::Variant<Glib::ustring> mesg;