Update fingerprint view on main thread

// FREEBIE

src/org/thoughtcrime/securesms/VerifyIdentityActivity.java

@@ -240,8 +240,13 @@ public class VerifyIdentityActivity extends PassphraseRequiredActionBarActivity
 
     @Override
     public void onModified(Recipients recipients) {
+      Util.runOnMain(new Runnable() {
+        @Override
+        public void run() {
           setFingerprintViews(fingerprint);
         }
+      });
+    }
 
     @Override
     public void onResume() {