fix: pass actual t1w files to summary interface (#3545)

Summary should receive the actual T1w files found, not a phony source
file

Closes #3530

Author: effigies

fmriprep/workflows/base.py

@@ -382,7 +382,7 @@ def init_single_subject_wf(
         ])  # fmt:skip
     else:
         workflow.connect([
-            (src_file, summary, [('source_file', 't1w')]),
+            (bidssrc, summary, [('t1w', 't1w')]),
             (src_file, ds_report_summary, [('source_file', 'source_file')]),
             (src_file, ds_report_about, [('source_file', 'source_file')]),
         ])  # fmt:skip