bash: Remove invisible outline of plain icon

[why]
When calculating the bounding box of the icon the real icon is too far
right. There is in fact a invisible box on the real icon's left.

[how]
Edit `svg` file directly (in vi) and just remove the outline's
description.

Signed-off-by: Fini Jastrow <ulf.fini.jastrow@desy.de>

Author: Finii