PeriodicProjectListCacheWarmer: Remove unneeded CheckReturnValue @SuppressWarnings

The annotation was added by change I12ce1bf2d when the run() method was
still calling cache.all() which did have a return value that was
ignored, but since change I8d2af4e8b it is calling
cache.refreshProjectList() now which doesn't have a return value. Hence
the annotation is no longer needed.

Release-Notes: skip
Signed-off-by: Edwin Kempin <ekempin@google.com>
Change-Id: I441a0ced8c635f576951e7f927fa5d9d75a5710f
diff --git a/java/com/google/gerrit/server/project/PeriodicProjectListCacheWarmer.java b/java/com/google/gerrit/server/project/PeriodicProjectListCacheWarmer.java
index 85a3ab9..df2e1cf 100644
--- a/java/com/google/gerrit/server/project/PeriodicProjectListCacheWarmer.java
+++ b/java/com/google/gerrit/server/project/PeriodicProjectListCacheWarmer.java
@@ -92,7 +92,6 @@
   }
 
   @Override
-  @SuppressWarnings("CheckReturnValue")
   public void run() {
     logger.atFine().log("Loading project_list cache");
     cache.refreshProjectList();