Removing old line preventing PyGRB workflows from starting

[sebastiangomezlopez]

We do not need this line of code anymore since --num-trials is now passed via config files

Standard information about the request

This is a: bug fix

This change affects: PyGRB

This change: has appropriate unit tests, follows style guidelines (See e.g. PEP8), has been proposed using the contribution guidelines

This change will: fix pycbc_make_offline_grb_workflow which is presently showing the following error:

Traceback (most recent call last):
  File "/home/sebastian.gomezlopez/.conda/envs/pygrb_prod/bin/pycbc_make_offline_grb_workflow", line 442, in <module>
    _workflow.setup_pygrb_pp_workflow(wflow, pp_dir, seg_dir,
  File "/home/sebastian.gomezlopez/.conda/envs/pygrb_prod/lib/python3.9/site-packages/pycbc/workflow/grb_utils.py", line 317, in setup_pygrb_pp_workflow
    node, trig_files = job_instance.create_node(wf.ifos, seg_dir, segment,
  File "/home/sebastian.gomezlopez/.conda/envs/pygrb_prod/lib/python3.9/site-packages/pycbc/workflow/grb_utils.py", line 375, in create_node
    node.add_opt("--num-trials", self.num_trials)
  File "/home/sebastian.gomezlopez/.conda/envs/pygrb_prod/lib/python3.9/site-packages/pycbc/workflow/pegasus_workflow.py", line 220, in add_opt
    raise ValueError(err_msg)
ValueError: Trying to set option --num-trials with value 6, but it has already been provided by the configuration file. Usually this should not be given in the config file, but contact developers to check

[titodalcanton]

I am going to ask @pannarale to review this, since I was the one suggesting we might need this change, but was not entirely sure.

[pannarale]

This is due to pycbc_make_offline_grb_workflow on master being out of date. I am opening at least 2 PRs to bring pycbc_make_offline_grb_workflow, grb_utils.py, and pycbc_pygrb_pp_workflow on master up to date with my local changes (which do run properly end-to-end)