When building a tar image the image size should not be specified. All image size fields are removed from the assembler options in the tar test cases.
Generated with $ sudo ./tools/test-case-generators/generate-test-cases --distro rhel-82 --arch x86_64 --store .osbuild/ --output test/cases/ (Partially) fixes #542. Signed-off-by: Tom Gundersen <teg@jklm.no>