main-window: Use CallsHistoryBox

This helps the window to be only a glue in between the actual UI
elements instead of handling a lot of the UI.

src/main.c

@@ -28,6 +28,7 @@
 #include <handy.h>
 
 #include "calls-encryption-indicator.h"
+#include "calls-history-box.h"
 #include "calls-main-window.h"
 #include "calls-mm-provider.h"
 
@@ -40,6 +41,7 @@ show_window (GtkApplication *app)
   CallsMainWindow *main_window;
 
   CALLS_TYPE_ENCRYPTION_INDICATOR;
+  CALLS_TYPE_HISTORY_BOX;
   HDY_TYPE_DIALER;
 
   connection = g_bus_get_sync (G_BUS_TYPE_SYSTEM, NULL, &error);