Watcher - re-enable test

This test is believed to be fixed by elastic#43939

closes elastic#43889

--------

This test is currently only muted master.

Jul 10 - muted in master
Aug 16 - elastic#43939 commited to master
Aug 22 - elastic#43939 backported to 7.x
Aug 23 - last recorded failure (on any branch)

x-pack/qa/smoke-test-watcher/src/test/resources/rest-api-spec/test/painless/10_basic.yml

@@ -127,9 +127,6 @@
 
 ---
 "Test execute watch api with rest_total_hits_as_int":
-  - skip:
-      version: "all"
-      reason: "AwaitsFix https://github.com/elastic/elasticsearch/issues/43889"
 
   - do:
       cluster.health: