Clear contact header

When updating the contact header widget, clear any stale info first
so we don't end up associating the wrong picture with a different
contact.
Fixed BC-triaged bug 2173406.

Change-Id: Ic4cabf8b88e8b0922308adefaeea9dd9467f9afa
diff --git a/src/com/android/mms/ui/ComposeMessageActivity.java b/src/com/android/mms/ui/ComposeMessageActivity.java
index 266f915..7bad0c0 100644
--- a/src/com/android/mms/ui/ComposeMessageActivity.java
+++ b/src/com/android/mms/ui/ComposeMessageActivity.java
@@ -1504,6 +1504,7 @@
     }
 
     private void bindToContactHeaderWidget(ContactList list) {
+        mContactHeader.wipeClean()
         switch (list.size()) {
             case 0:
                 String recipient = "";