fix(linux): set environment variable for rendering of downloads dialog 🍒 🏠 #12617
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This works around a problem in webkit2gtk where the download dialog sometimes only renders a blank screen. Setting the environment variable seems to help, not only in the cases that the issue describes (with a NVidia graphics card), but also in my testing in a VM.
Fixes: #12587
Cherry-pick-of: #12616
User Testing
TEST_DOWNLOAD_PAGE: Open Keyman Config and click on the Download Keyboard button. The Download Keyman Keyboards page should show up.