SpannerEmulatorContainer: remove unused @Inject annotation

Instances of this class are created explicitly, no Guice injection is
used.

Change-Id: If6734a114a8f17fc28b954f452000b9c4e2d7d38
diff --git a/src/test/java/com/googlesource/gerrit/plugins/spannerrefdb/EmulatedSpannerRefDb.java b/src/test/java/com/googlesource/gerrit/plugins/spannerrefdb/EmulatedSpannerRefDb.java
index 3fa81e9..7ce34ed 100644
--- a/src/test/java/com/googlesource/gerrit/plugins/spannerrefdb/EmulatedSpannerRefDb.java
+++ b/src/test/java/com/googlesource/gerrit/plugins/spannerrefdb/EmulatedSpannerRefDb.java
@@ -34,7 +34,6 @@
 import com.google.cloud.spanner.Spanner;
 import com.google.cloud.spanner.SpannerOptions;
 import com.google.gerrit.server.config.PluginConfigFactory;
-import com.google.inject.Inject;
 import java.io.IOException;
 import java.util.Collections;
 import java.util.concurrent.ExecutionException;
@@ -60,7 +59,6 @@
   private final SpannerRefDatabase spannerRefDb;
   private final Configuration pluginConfig;
 
-  @Inject
   public EmulatedSpannerRefDb() throws Exception {
     container =
         new SpannerEmulatorContainer(