Watcher: Fixed YAML syntax for `xpack.watcher.stats` calls in REST tests

The shorthand format has been failing in the Ruby runner. Not sure if
this is particular to the Ruby YAML library, but I think there's no
harm in making the syntax standard.

Original commit: elastic/x-pack-elasticsearch@d753cad64a

elasticsearch/x-pack/watcher/src/test/resources/rest-api-spec/test/xpack/watcher/array_compare_watch/10_basic.yaml

@@ -10,7 +10,8 @@
           wait_for_status: yellow
 
 
-  - do: {xpack.watcher.stats:{}}
+  - do:
+      xpack.watcher.stats: {}
   - match: { "watcher_state": "started" }
   - match: { "watch_count": 0 }
 
@@ -93,7 +94,8 @@
   - do:
       indices.refresh: {}
 
-  - do: {xpack.watcher.stats:{}}
+  - do:
+      xpack.watcher.stats: {}
   - match: { "watch_count": 1 }
 
   # Simulate a Thread.sleep()
@@ -142,5 +144,6 @@
   - match: { found: true }
 
 
-  - do: {xpack.watcher.stats:{}}
+  - do:
+      xpack.watcher.stats: {}
   - match: { "watch_count": 0 }

elasticsearch/x-pack/watcher/src/test/resources/rest-api-spec/test/xpack/watcher/getting_started/10_monitor_cluster_health.yaml

@@ -5,7 +5,8 @@
           wait_for_status: yellow
 
 
-  - do: {xpack.watcher.stats:{}}
+  - do:
+      xpack.watcher.stats: {}
   - match: { "watcher_state": "started" }
   - match: { "watch_count": 0 }
 
@@ -52,7 +53,8 @@
   - match: { _id: "cluster_health_watch" }
   - match: { created: true }
 
-  - do: {xpack.watcher.stats:{}}
+  - do:
+      xpack.watcher.stats: {}
   - match: { "watch_count": 1 }
 
   # Simulate a Thread.sleep()
@@ -101,5 +103,6 @@
   - match: { found: true }
 
 
-  - do: {xpack.watcher.stats:{}}
+  - do:
+      xpack.watcher.stats: {}
   - match: { "watch_count": 0 }