Fix UnnecessaryAssignment by removing @Mock from authConfig

authConfig is initialized manually in the test. Remove the @Mock
annotation to avoid conflicting with Mockito’s automatic injection.

Change-Id: I6b8ace8beace4c7ea42ba30378eed942ba68a731

src/test/java/com/googlesource/gerrit/plugins/download/DownloadCommandTest.java

diff --git a/src/test/java/com/googlesource/gerrit/plugins/download/DownloadCommandTest.java b/src/test/java/com/googlesource/gerrit/plugins/download/DownloadCommandTest.java
index aeb7008..11bd210 100644
--- a/src/test/java/com/googlesource/gerrit/plugins/download/DownloadCommandTest.java
+++ b/src/test/java/com/googlesource/gerrit/plugins/download/DownloadCommandTest.java
@@ -36,7 +36,6 @@
 import org.eclipse.jgit.lib.Config;
 import org.junit.Before;
 import org.junit.Ignore;
-import org.mockito.Mock;
 import org.mockito.Mockito;
 
 @Ignore
@@ -107,7 +106,7 @@
   protected SshScheme sshScheme;
   protected Provider<String> urlProvider;
   protected Provider<CurrentUser> userProvider;
-  protected @Mock AuthConfig authConfig;
+  protected AuthConfig authConfig;
 
   public DownloadCommandTest() {
     super();