Fixed minor typo in last change (apache#3369)

Author: JWT007

log4j-core/src/main/java/org/apache/logging/log4j/core/config/LoggerConfig.java

@@ -954,7 +954,7 @@ public B withtFilter(final Filter filter) {
                 return asBuilder();
             }
 
-            public B withFilter(final Filter filterr) {
+            public B withFilter(final Filter filter) {
                 this.filter = filter;
                 return asBuilder();
             }