Fix device ID check, clean up prekey fetch logging (#1961)

* DeviceId is a string, so we use the less-strict comparison

* Clean up prekey fetch logging

libtextsecure/sendmessage.js

@@ -422,7 +422,7 @@ MessageSender.prototype = {
         var myDevice = textsecure.storage.user.getDeviceId();
         var now = Date.now();
 
-        if (myDevice === 1) {
+        if (myDevice == 1) {
             return Promise.resolve();
         }