emergency-calls-manager: Init emergency type database

We so far did this on first access. Let's rather do it explicitly
so we notice problems early on startup.

Signed-off-by: Guido Günther <agx@sigxcpu.org>
Part-of: <https://gitlab.gnome.org/GNOME/calls/-/merge_requests/790>

tests/test-emergency-call-types.c

@@ -46,9 +46,15 @@ int
 main (int   argc,
       char *argv[])
 {
+  gint ret;
   g_test_init (&argc, &argv, NULL);
 
+  calls_emergency_call_types_init ();
+
   g_test_add_func ("/Calls/EmergencyCallTypes/lookup", test_lookup);
 
-  return g_test_run ();
+  ret = g_test_run ();
+
+  calls_emergency_call_types_destroy ();
+  return ret;
 }