dirtyetc: fix initial error color

Lars Kollstedtrequested to merge
larskoll-guest/hobbit-plugins:larskoll-fix-invalid-color-in-initial-error into master

The color is called "red" not "rot".

This is more a cosmetic fix to avoid: Error: color rot unknown at /usr/share/perl5/Hobbit.pm line 131.

I don't know anything about german localizations in Xymon colors, yet. And this is to hardcoded to be something like that. ;-)

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