fix(nvidia): use vulkan renderer by default to mitigate flickering #211
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Recently flickering on sericea-nvidia was reported in the HWE repo: ublue-os/hwe#260. A workaround or "fix" for a large amount of the flickering on sway is to switch to the vulkan renderer, the nvidia GPUs we support also support the vulkan required extensions and version.
I also added an environment variable that fixes some java applications: _JAVA_AWT_WM_NONREPARENTING=1
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