fix: revert task name to just 'wfbench.py'

Author: ftschirpke

wfcommons/wfbench/bench.py

@@ -293,7 +293,7 @@ def _set_argument_parameters(self,
             task.runtime = 0
             if clear_files:
                 task.files = []
-            task.program = f"{this_dir.joinpath('wfbench.py')}"
+            task.program = "wfbench.py"
             task.args = [task.name]
             task.args.extend(params)