Only update SMS setting if registration is complete.

Otherwise you could crash during registration if the user had previously
set Signal as the default.

app/src/main/java/org/thoughtcrime/securesms/keyvalue/SettingsValues.java

@@ -359,7 +359,7 @@ public final class SettingsValues extends SignalStoreValues {
   public void setDefaultSms(boolean value) {
     boolean lastKnown = getBoolean(DEFAULT_SMS, false);
 
-    if (value != lastKnown) {
+    if (value != lastKnown && SignalStore.registrationValues().isRegistrationComplete()) {
       Log.i(TAG, "Default SMS state changed! Scheduling a storage sync.");
       putBoolean(DEFAULT_SMS, value);