Mark hello_world_macos__compile unflaky (#160998)

This should have been marked unflaky when
https://github.com/flutter/flutter/issues/159542 was closed.

.ci.yaml

diff --git a/.ci.yaml b/.ci.yaml
index 0c7ba50..50e146a 100644
--- a/.ci.yaml
+++ b/.ci.yaml
@@ -4201,7 +4201,6 @@
       - DEPS
 
   - name: Mac_benchmark hello_world_macos__compile
-    bringup: true # Flaky https://github.com/flutter/flutter/issues/159542
     presubmit: false
     recipe: devicelab/devicelab_drone
     timeout: 60