fix(profile): write .tox file immediately on creation

Fixes issue where .tox file of a new profile wasn't written until
connection was established.

src/persistence/profile.cpp

@@ -264,6 +264,7 @@ void Profile::initCore(const QByteArray& toxsave, const ICoreSettings& s, bool i
     if (isNewProfile) {
         core->setStatusMessage(tr("Toxing on qTox"));
         core->setUsername(name);
+        onSaveToxSave();
     }
 
     // save tox file when Core requests it