Apply ruff/flake8-simplify rule SIM401

SIM401 Use `.get()` instead of an `if` block

nireports/tools/timeseries.py

@@ -73,7 +73,7 @@ def cifti_timeseries(dataset):
     }
     seg = {label: [] for label in list(labels.values()) + ["Other"]}
     for bm in matrix.get_index_map(1).brain_models:
-        label = "Other" if bm.brain_structure not in labels else labels[bm.brain_structure]
+        label = labels.get(bm.brain_structure, "Other")
         seg[label] += list(range(bm.index_offset, bm.index_offset + bm.index_count))
 
     return dataset.get_fdata(dtype="float32").T, seg