[DATALAD RUNCMD] Fix other (original) sources for millimiter typo (no…

…t sure why codespell did not pick it up

=== Do not change lines below ===
{
 "chain": [],
 "cmd": "git-sedi millimiter millimeter",
 "exit": 0,
 "extra_inputs": [],
 "inputs": [],
 "outputs": [],
 "pwd": "."
}
^^^ Do not change lines above ^^^

datalad_neuroimaging/extractors/nifti1.py

@@ -40,8 +40,8 @@
 
 unit_map = {
     'meter': ('meter', 'uo:0000008'),
-    'millimeter': ('millimiter', 'uo:0000016'),
-    'mm': ('millimiter', 'uo:0000016'),
+    'millimeter': ('millimeter', 'uo:0000016'),
+    'mm': ('millimeter', 'uo:0000016'),
     'micron': ('micrometer', 'uo:0000017'),
     'second': ('second', 'uo:0000010'),
     'sec': ('second', 'uo:0000010'),