Fix test method for showing promo card.

Bug: 23422274
Change-Id: Ib67080b2eb71006eb52cbef58983788baa97c712
diff --git a/tests/src/com/android/dialer/calllog/CallLogAdapterTest.java b/tests/src/com/android/dialer/calllog/CallLogAdapterTest.java
index 2bdc197..5c2588a 100644
--- a/tests/src/com/android/dialer/calllog/CallLogAdapterTest.java
+++ b/tests/src/com/android/dialer/calllog/CallLogAdapterTest.java
@@ -247,7 +247,7 @@
         }
 
         public void showVoicemailPromoCard(boolean show) {
-            mShowVoicemailPromoCard = true;
+            mShowVoicemailPromoCard = show;
         }
     }