Remove 'eval' from b to fix quoted arguments.

eval doesn't seem to be necessary and using it breaks quoted args to query.

    $ b cquery 'kind(test, //build/bazel/...)'
    -bash: eval: line 99: syntax error near unexpected token `('
    -bash: eval: line 99: ')`bazel cquery kind(test, //build/bazel/...)
    ---config=bp2build ''

Test: source and rerun b cquery with quoted args
Change-Id: I2b8c4387ab729b5f927fe5a629d3a4cd58bcf901