Replace black arrow (`▶`) with `►`

[tuanchauict]

          Not sure its related, but I would love to have the arrows like asciiflow.

This ► instead of ▶

It makes the vertical lines misaligned

You can notice it in the example on the README.md page and below.

Example : Current :

                 ─       │           ├───────○──┤/  547 │                    
                GND      │           │       │  │ ▶     │                    
                         │           │      ╭┴╮   │     │                    

With suggested arrow :

                 ─       │           ├───────○──┤/  547 │                    
                GND      │           │       │  │ ►     │                    
                         │           │      ╭┴╮   │     │                    

I like the idea that we can keep it as vanilla as possible without having to use fonts like jetbrains mono (even if its a cool font), but can use fonts like monospace or courier.

Originally posted by @klausdk in https://github.com/tuanchauict/MonoSketch/issues/586#issuecomment-2144619182

[tuanchauict]

Answer: https://github.com/tuanchauict/MonoSketch/issues/586#issuecomment-2151069590

[tuanchauict]

@klausdk I create a new issue for your request. This is being addressed with #604

[tuanchauict]

On alpha now