Fix bad math expression error when IFS doesn't contain space
Fix bad math expression error when IFS doesn't contain space

When the previous prompt contains highlight and IFS doesn't contain space,
calling filter-select results in the following error:

filter-select:136: bad math expression: operator expected at `14 fg=blue...'

This is fixed by specifying the delimiter for the read command.

vapniks/zaw,junkblocker/zaw,brandon-fryslie/zaw,willghatch/zaw