Support `rgb(R G B)` (without commas) as valid color format
#### Steps to reproduce: - Open [this](https://gitlab.com/openingdesign/milwaukee_st_4429/-/blob/6e1e3682c2a7d968a2797bfc7a274a695046d704/Models/BlenderBIM/sheets/A700%20-%20DETAILS.svg) svg in Inkscape 1.3 - Expect to see patterns rendered like.. ![image](/uploads/1f65563681893cdcfe565454d3eaf654/image.png) - instead see... ![image](/uploads/845b6efd8f6af49dbf3e38e6def0e239/image.png) #### #### What should have happened? * would expect the pattern to show correctly. #### Inkscape Version and Operating System: - Inkscape Version: 1.3 - Operating System: Windows - Operating System version: 10
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