Make the "D" in `gdk-lg.svg` look more like a "D"

Description

With Update error pages (!160374 - merged) merged, we introduced a cool illustration to show when the GDK is loading. When my wife walked by and looked at the computer screen she asked "What does gok mean?"

Could we make the "D" look more like a "D" and less like an "O"?

Current	More like a "D"