Fix #639: unskip and harden the vcenter colormap test - #823

Fix #639: unskip and harden the vcenter colormap test#823

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jessiedoe03-cpu:fix/issue-639-turn-a-skipped-vcenter-2d-plot-check-intjessiedoe03-cpu/UltraPlot:fix/issue-639-turn-a-skipped-vcenter-2d-plot-check-intCopy head branch name to clipboard