lldbutil.run_to_line_breakpoint had usages that set column breakpoints,
so I thought there was coverage of that on the command-line, but
actually all the `run_to` utilities use the SB API's, and there weren't
any tests of setting file line & column breakpoint through
`run_break_set`. So I missed that I had typed the column option `c` -
that's taken by `--command`.
This patch fixes that typo and adds a CLI test for file + line + column.
0ce6d56996