Fixes #162 (#163)

Author: kutsal

src/main/java/com/launchdarkly/client/LDConfig.java

@@ -541,7 +541,7 @@ public Builder userKeysCapacity(int capacity) {
      * @return the builder
      */
     public Builder userKeysFlushInterval(int flushInterval) {
-      this.flushIntervalSeconds = flushInterval;
+      this.userKeysFlushInterval = flushInterval;
       return this;
     }
 
@@ -593,4 +593,4 @@ public LDConfig build() {
       return new LDConfig(this);
     }
   }
-}
+}