original-source: Cleanup four svgs

[why]
The CI process produces a different font than running the
generate-original-source script locally.

Several thing have been checked, to no avail, see #1227.

Turned out the affected SVGs all are somehow ... questionable in their
construction.

[how]
Open SVGs in inkscape, select all (points) and generate new, clean
outline with Path->Union.
Save as optimized SVG.

The (CI) created font file now looks good.

But the cause is still unknown, maybe some sub-library that is used has
changed? I have no clue. Meaning it runs ok locally seems to be no
guarantee it will look the same when run by the CI :-(

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