FIX: Add datasink fill-in step to resampling level (#3254)

Closes #3253.

## Changes proposed in this pull request

- Copy code used to fill in `source_file` and `base_directory` fields
for reportlet datasinks in `init_bold_wf` for the `full` level to the
`resampling` level as well.
- AFAICT, the only reportlets that should be generated by the resampling
level are `ds_report_t2scomp` and `ds_report_t2star_hist`, so I could
directly add these fields to those nodes, but this approach seems more
robust.

fmriprep/workflows/bold/base.py

@@ -372,6 +372,11 @@ def init_bold_wf(
         ])  # fmt:skip
 
     if config.workflow.level == "resampling":
+        # Fill-in datasinks of reportlets seen so far
+        for node in workflow.list_node_names():
+            if node.split('.')[-1].startswith('ds_report'):
+                workflow.get_node(node).inputs.base_directory = fmriprep_dir
+                workflow.get_node(node).inputs.source_file = bold_file
         return workflow
 
     # Resample to anatomical space