fix(newm-admin): Fix AppImage icon on Linux #26

Job	Run time
Build (windows-latest, windows, x86_64-pc-windows-msvc, stable)	4m 16s
Build (ubuntu-24.04, ubuntu24, x86_64-unknown-linux-gnu, stable)	4m 9s
Build (macos-latest, macos, aarch64-apple-darwin, stable)	4m 22s
	12m 47s

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