Fix wrong variable in AccountManagerService's TokenCache

// mAccountEvictors.put(k.account, tokenEvictor);
// should be:
mAccountEvictors.put(k.account, accountEvictor);

This error in putToken() method causes the confusion of mAccountEvictors,
and may causes the evict() method does not clean up the cache data correctly.

Change-Id: I9435c206a6fa4d90177bbbe8816004365a213d1b
Signed-off-by: Haohua Li <lihaohua90@gmail.com>

services/core/java/com/android/server/accounts/TokenCache.java

@@ -148,7 +148,7 @@ import java.util.Objects;
                 accountEvictor = new Evictor();
             }
             accountEvictor.add(k);
-            mAccountEvictors.put(k.account, tokenEvictor);
+            mAccountEvictors.put(k.account, accountEvictor);
 
             // Only cache the token once we can remove it directly or by account.
             put(k, v);