Add missing icons to fitness/sky.yaml

This is just fallout from not having
https://github.com/domokit/sky_engine/issues/565

@abarth
diff --git a/examples/fitness/sky.yaml b/examples/fitness/sky.yaml
index 51208a1..9738601 100644
--- a/examples/fitness/sky.yaml
+++ b/examples/fitness/sky.yaml
@@ -2,9 +2,11 @@
   - name: action/assessment
   - name: action/help
   - name: action/settings
+  - name: action/view_list
+  - name: av/stop
   - name: content/add
   - name: maps/directions_run
   - name: navigation/arrow_back
+  - name: navigation/close
   - name: navigation/menu
   - name: navigation/more_vert
-  - name: av/stop