Always return true if AppInitMain got to the end

This should fix a very rare travis failure in zapwallettxes, but
is also more correct, as you can currently race
ReacceptWalletTransactions with stop RPC calls to get bitcoind to
(IMO) eroneously return a non-0 exit code.

src/init.cpp

@@ -1933,6 +1933,5 @@ bool AppInitMain()
     }
 #endif
 
-
-    return !fRequestShutdown;
+    return true;
 }