fix: pass the parameter value of enableConnectionPool instead of true…

… always (#2096)

* fix: pass the parameter value of enableConnectionPool instead of true always

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google-cloud-bigquerystorage/src/main/java/com/google/cloud/bigquery/storage/v1/JsonStreamWriter.java

@@ -320,7 +320,7 @@ public Builder setReconnectAfter10M(boolean reconnectAfter10M) {
      * @return Builder
      */
     public Builder setEnableConnectionPool(boolean enableConnectionPool) {
-      this.schemaAwareStreamWriterBuilder.setEnableConnectionPool(true);
+      this.schemaAwareStreamWriterBuilder.setEnableConnectionPool(enableConnectionPool);
       return this;
     }