Fix trimmed display issue of lines containing hard tabs

Current version of multitail may trim the line depending on the line length when there are hard tabs in line. This commit will fix the issue.
Could you please test the issue with following case?

printf '\t\t1\t12\t123\t1234\t12345\t123456\t1234567\t12345678\t1Find-End-Here!\n' | ./multitail -j

Thanks!