test(container): correct color

src/container.zig

@@ -217,7 +217,7 @@ pub const Border = packed struct {
 
         var container: Container(event.SystemEvent) = try .init(std.testing.allocator, .{
             .border = .{
-                .color = .blue,
+                .color = .green,
                 .sides = .horizontal,
             },
         }, .{});