test: simplify test-tcp-try-write
test: simplify test-tcp-try-write

Use a smaller buffer thus making sure that uv_try_write will succeed at
least once

unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso,unknownbrackets/maxcso