Update .rcomp with proper executable path

The old directory structure of marktab (from what I can tell) had an executable
in `bin`. `bin` no longer exists and the `cli` executable located at
`examples/cli` seems to now serve this purpose. This commit tells rcomp to test
against `examples/cli` instead of the old (it seems now nonexistant)
executable.

This allows the rcomp tests to run but none pass.