Fixed incorrect variable name in contig parsing

Author: javierbq

rfdiffusion/contigs.py

@@ -82,7 +82,7 @@ def __init__(
             # specifying precise mappings
             self.ref = ref_idx
             self.hal = hal_idx
-            self.rf = rf_idx
+            self.rf = idx_rf
         self.mask_1d = [False if i == ("_", "_") else True for i in self.ref]
         # take care of sequence and structure masking
         if self.inpaint_seq_tensor is None: