Screen should be cleared fully with color rendering

[joyalicegu]

Example: visit someone with a dead plant, the gravestone is rendered, then if you select "visit" again, the screen should go back to your own plant. If your plant is a seed, in the color rendering condition, the screen is not completely cleared, and ghost characters in non-drawn-over areas of the screen are still there (e.g. you would be able to see the upper and right edges of the gravestone).

This bug doesn't occur when NO_COLOR=1 is set.

@joyalicegu

[joyalicegu]

I think this is caused by the "Handle overflowing art gracefully" bit in ansi_render() in menu_screen.py.