[FIX] Correct capitalization in entities.yaml

- Minor correction to `tracksys` display name to match other entity display names

src/schema/objects/entities.yaml

@@ -410,7 +410,7 @@ tracer:
   format: label
 tracksys:
   name: tracksys
-  display_name: Tracking system
+  display_name: Tracking System
   description: |
     The `tracksys-<label>` entity can be used as a key-value pair
     to label *_motion.tsv and *_motion.json files.