oiiotool: Fix --eraseattrib not applying to all subimages #2632
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Either -a or optional modifier :allsubimages=1 ought to have erased
an attribute from all subimages, but it was erased from only the first.
Add a test to verify that --attrib and --eraseattrib both apply
correctly to all subimages when requested.
Signed-off-by: Larry Gritz lg@larrygritz.com