LfsLocksAction: Use Logger's built-in string formatting

Change-Id: I3203070920416fd824b13042460d9996b7885b7d

src/main/java/com/googlesource/gerrit/plugins/lfs/locks/LfsLocksAction.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/lfs/locks/LfsLocksAction.java b/src/main/java/com/googlesource/gerrit/plugins/lfs/locks/LfsLocksAction.java
index 8a13514..4fa8680 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/lfs/locks/LfsLocksAction.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/lfs/locks/LfsLocksAction.java
@@ -108,9 +108,7 @@
         Strings.isNullOrEmpty(control.getUser().getUserName())
             ? "anonymous"
             : control.getUser().getUserName();
-    log.debug(
-        String.format(
-            "operation %s unauthorized for user %s on project %s", op, userName, project));
+    log.debug("operation {} unauthorized for user {} on project {}", op, userName, project);
     throw new LfsUnauthorized(op, project);
   }
 }