Update keypoint detection template (#4114)

* added default template

* update field

Author: kprokofi

src/otx/tools/templates/keypoint_detection/rtmpose_tiny/template.yaml

@@ -23,3 +23,7 @@ training_targets:
 # Computational Complexity
 gigaflops: 1.3
 size: 3.1
+
+# Model spec
+model_category: SPEED
+is_default_for_task: true