testing.zig: init directly on .serve

src/testing.zig

@@ -491,11 +491,9 @@ test "tests:beforeAll" {
     const test_allocator = @import("root").tracking_allocator;
 
     test_config = try Config.init(test_allocator, "test", .{ .serve = .{
-        .common = .{
-            .tls_verify_host = false,
-            .user_agent_suffix = "internal-tester",
-            .ws_max_concurrent = 50,
-        },
+        .insecure_disable_tls_host_verification = true,
+        .user_agent_suffix = "internal-tester",
+        .ws_max_concurrent = 50,
     } });
 
     test_app = try App.init(test_allocator, &test_config);