1267b35 fuzz: shorten filename of testcase

1 file Authored by Yu Watanabe a year ago, Committed by zbyszek a year ago,
    fuzz: shorten filename of testcase
    
    Follow-up for 46dc071985ff487f5ccf20808531168a6add73d3 and
    76519cecc749a3d0e2054fd6db8a99143666e123.
    
    (cherry picked from commit 029a7f5a0e7c3315d8d8f6c4d3d658c32aa35461)
    
        
test/fuzz/fuzz-bootspec/oss-fuzz-53578 test/fuzz/fuzz-bootspec/clusterfuzz-testcase-minimized-fuzz-bootspec-5731869371269120
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