Update validate command to use dash syntax for --ignore-nifti-headers argument

Author: gabridele

cubids/workflows.py

@@ -231,7 +231,7 @@ def validate(
             linked_output_prefix_t,
         ]
         if ignore_nifti_headers:
-            cmd.append("--ignore_nifti_headers")
+            cmd.append("--ignore-nifti-headers")
 
     elif container_type == "singularity":
         cmd = [
@@ -250,7 +250,7 @@ def validate(
             linked_output_prefix_t,
         ]
         if ignore_nifti_headers:
-            cmd.append("--ignore_nifti_headers")
+            cmd.append("--ignore-nifti-headers")
 
         if sequential:
             cmd.append("--sequential")