Jonas Jenwald 06605abbc2 Avoid rendering errors by passing in the webGLContext when creating a new CanvasGraphics in getColorN_Pattern (PR 9095 follow-up)
This was an oversight in PR 9095, which unfortunately breaks rendering in some PDF files (e.g. the one from issue 6737).

It thus appears that we don't have any test-coverage for this code-path, and given the relative complexity of the PDF files affected by this bug I wasn't able to easily create a reduced test-case.
*Please note:* The linked test-case included in this patch is currently *not* rendered correctly (that'd be the PR 6606), but it at least gives us some test-coverage here.
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