Change in the fuzzing scheme of `fuzz-close_tx` led to the
discovery of test inputs that result in greater in code
coverage. Add these inputs to the test's seed corpus.
These corpora were generated with default libFuzzer flags with 30+ hours
of CPU time, and then minimized with:
./fuzz-TARGET -merge=1 -shuffle=0 -prefer_small=1 -use_value_profile=1 corpora/fuzz-TARGET UNMINIMIZED_CORPUS