fix: fix skip logging on exporter closing (#2892)

Change-Id: I6fbe6935d51dfb67aaba5500ca391abc5fec9401

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Fixes #<issue_number_goes_here> ☕️

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Author: mutianf

google-cloud-bigtable/src/main/java/com/google/cloud/bigtable/data/v2/internal/csm/exporter/BigtableCloudMonitoringExporter.java

@@ -195,7 +195,7 @@ public void onFailure(Throwable throwable) {
               RuntimeException asyncWrapper = new RuntimeException("export failed", throwable);
               asyncWrapper.setStackTrace(stackTrace);
 
-              if (state.get() != State.Closing || state.get() != State.Closed) {
+              if (state.get() != State.Closing && state.get() != State.Closed) {
                 // ignore the export warning when client is shutting down
                 LOGGER.log(Level.WARNING, msg, asyncWrapper);
               }