FEATURE: Make initial admins TL1

* Match register controller TL to rake admin:create
* Don't promote if trust_level > 1

app/controllers/finish_installation_controller.rb

@@ -27,6 +27,7 @@ class FinishInstallationController < ApplicationController
       @user.password_required!
 
       if @user.save
+        @user.change_trust_level!(1) if @user.trust_level < 1
         send_signup_email
         return redirect_confirm(@user.email)
       end

spec/requests/finish_installation_controller_spec.rb

@@ -102,6 +102,15 @@ describe FinishInstallationController do
         end
       end
 
+      it "sets the admins trust level" do
+        post "/finish-installation/register.json", params: {
+          email: 'robin@example.com',
+          username: 'eviltrout',
+          password: 'disismypasswordokay'
+        }
+
+        expect(User.find_by(username: 'eviltrout').trust_level).to eq 1
+      end
     end
   end