Fix translog validate param

Author: pado0

server/src/main/java/org/opensearch/index/translog/TranslogStats.java

@@ -225,7 +225,7 @@ public Builder uncommittedSizeInBytes(long bytes) {
         }
 
         public Builder earliestLastModifiedAge(long age) {
-            if (earliestLastModifiedAge < 0) {
+            if (age < 0) {
                 throw new IllegalArgumentException("earliestLastModifiedAge must be >= 0");
             }
             this.earliestLastModifiedAge = age;