efi: change `--update-firmware` to match current Anaconda logic #1438

Job	Run time
Lints, pinned toolchain	26s
Tests (release), minimum supported toolchain	41s
Tests, unstable toolchain (beta)	21s
Tests, unstable toolchain (nightly)	45s
Tests, stable toolchain	12s
Tests (release), stable toolchain	32s
	2m 57s

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