Remove custom label from Exchange assistant (it was not synced...)

... and caused confusion

Bug:2604139
Change-Id: Ie55e1e3402cfca13402ed0e17eb834be39283cce
diff --git a/src/com/android/contacts/model/ExchangeAccountType.java b/src/com/android/contacts/model/ExchangeAccountType.java
index 0e96643..910dfc6 100644
--- a/src/com/android/contacts/model/ExchangeAccountType.java
+++ b/src/com/android/contacts/model/ExchangeAccountType.java
@@ -145,7 +145,7 @@
             kind.typeList
                     .add(buildPhoneType(Phone.TYPE_RADIO).setSecondary(true).setSpecificMax(1));
             kind.typeList.add(buildPhoneType(Phone.TYPE_ASSISTANT).setSecondary(true)
-                    .setSpecificMax(1).setCustomColumn(Phone.LABEL));
+                    .setSpecificMax(1));
 
             kind.fieldList = Lists.newArrayList();
             kind.fieldList.add(new EditField(Phone.NUMBER, R.string.phoneLabelsGroup, FLAGS_PHONE));