wmllint: handle SPECIAL_NOTES_DEFENSE_CAP

Also silenced a wmllint warning that this commit throws on the Chocobone unit.

data/core/units/undead/Skele_Chocobone.cfg

@@ -10,6 +10,7 @@
         hills=60
         mountains=50
         fungus=60
+        # wmllint: match forest=-70 with {SPECIAL_NOTES_DEFENSE_CAP}
         forest=-70
         village=60
     [/defense]

data/tools/wmllint

@@ -938,6 +938,7 @@ def standard_unit_filter():
 
 # Associations for the ability sanity checks.
 notepairs = [
+    ("movement_type=mounted", "{SPECIAL_NOTES_DEFENSE_CAP}"),
     ("movement_type=undeadspirit", "{SPECIAL_NOTES_SPIRIT}"),
     ("type=arcane", "{SPECIAL_NOTES_ARCANE}"),
     ("{ABILITY_HEALS}", "{SPECIAL_NOTES_HEALS}"),