Messaging: Do not check preferred sim if conversation sim exist

Fix unable to send message when preferred sms sim is set to
"Ask every time".

Change-Id: I0406985e29ded8157ae5252db2dd814856a93376

src/com/android/messaging/util/UiUtils.java

@@ -342,10 +342,8 @@ public class UiUtils {
 
         // Have all the conditions been met:
         // Supports SMS?
-        // Has a preferred sim?
         // Is the default sms app?
         return phoneUtils.isSmsCapable() &&
-                phoneUtils.getHasPreferredSmsSim() &&
                 phoneUtils.isDefaultSmsApp();
     }