fix toString test

Change-Id: I92a22daa8ed049b94093eccb054cdb2d401ffdea

Author: igorbernstein2

google-cloud-bigtable/src/main/java/com/google/cloud/bigtable/data/v2/stub/EnhancedBigtableStubSettings.java

@@ -983,7 +983,7 @@ public String toString() {
         .add("instanceId", instanceId)
         .add("appProfileId", appProfileId)
         .add("isRefreshingChannel", isRefreshingChannel)
-        .add("perOpSettings.", perOpSettings)
+        .add("perOpSettings", perOpSettings)
         .add("metricsProvider", metricsProvider)
         .add("metricsEndpoint", metricsEndpoint)
         .add("areInternalMetricsEnabled", areInternalMetricsEnabled)

google-cloud-bigtable/src/test/java/com/google/cloud/bigtable/data/v2/stub/EnhancedBigtableStubSettingsTest.java

@@ -919,19 +919,7 @@ public void isRefreshingChannelFalseValueTest() {
     "instanceId",
     "appProfileId",
     "isRefreshingChannel",
-    "readRowsSettings",
-    "readRowSettings",
-    "sampleRowKeysSettings",
-    "mutateRowSettings",
-    "bulkMutateRowsSettings",
-    "bulkReadRowsSettings",
-    "checkAndMutateRowSettings",
-    "readModifyWriteRowSettings",
-    "generateInitialChangeStreamPartitionsSettings",
-    "readChangeStreamSettings",
-    "pingAndWarmSettings",
-    "executeQuerySettings",
-    "prepareQuerySettings",
+    "perOpSettings",
     "metricsProvider",
     "metricsEndpoint",
     "areInternalMetricsEnabled",