UI: Fix UpdateWaitWindow.axaml windows being too big on windows #559

Job	Run time
pr_build / macOS Universal (Debug)	6m 8s
pr_build / win-x64 (Debug)	10m 13s
pr_build / macOS Universal (Release)	5m 49s
pr_build / linux-x64 (Debug)	5m 9s
pr_build / linux-arm64 (Debug)	2m 58s
pr_build / osx-x64 (Debug)	7m 47s
pr_build / win-x64 (Release)	7m 37s
pr_build / linux-x64 (Release)	4m 26s
pr_build / linux-arm64 (Release)	2m 53s
pr_build / osx-x64 (Release)	4m 10s
	57m 10s

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