rf: Pass fallback_trt to SDC fit workflows

Author: effigies

fmriprep/workflows/base.py

@@ -553,7 +553,10 @@ def init_single_subject_wf(subject_id: str):
         from sdcflows import fieldmaps as fm
         from sdcflows.workflows.base import init_fmap_preproc_wf
 
+        fallback_trt = config.workflows.fallback_total_readout_time
         fmap_wf = init_fmap_preproc_wf(
+            use_metadata_estimates=fallback_trt == 'estimated',
+            fallback_total_readout_time=fallback_trt if isinstance(fallback_trt, float) else None,
             debug='fieldmaps' in config.execution.debug,
             estimators=fmap_estimators,
             omp_nthreads=omp_nthreads,