silx.gui.plot: Added workaround for erroneous DPI reported by Qt #4038
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This avoids display issues when the reported screen DPI is obviously wrong.
This has been seen with Dell U4919DW screen on ubuntu20.04 where xrandr reports a "physical" screen size of 1mm x 1mm leading to crazy dpi.
I set the threshold to 1000dpi which is higher than the highest smartphone screen resolution as of today.