Simplify color/marker disambiguation logic in _process_plot_format. #27829
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There's a bit of code in the parsing of plot() format shorthands to disambiguate the "1" marker and the "1.0" grayscale color string. It's actually easier to just explicitly check for the bad strings.
This also makes it clearer that we could have supported "0" as unambiguous color string (white) as there's no "0" marker (there's a 0 (int) marker, which is not the same...), but let's not bother with changing any semantics.
Noted while looking at #27827 and #27828.
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