Revert "Use inflector rule to acronym Api to API"

This reverts commit 06f5eb10d4.

spec/factories/api_user.rb

@@ -1,7 +1,7 @@
 FactoryBot.define do
   factory :api_user do
     sequence(:username) { |n| "test#{n}" }
-    password 'a' * APIUser.min_password_length
+    password 'a' * ApiUser.min_password_length
     roles ['super']
     registrar
 

spec/models/api_user_spec.rb

@@ -1,16 +1,16 @@
 require 'rails_helper'
 
-RSpec.describe APIUser do
+RSpec.describe ApiUser do
   context 'with invalid attribute' do
     before do
-      @api_user = APIUser.new
+      @api_user = ApiUser.new
     end
 
     it 'should not be valid' do
       @api_user.valid?
       @api_user.errors.full_messages.should match_array([
         "Password Password is missing",
-        "Password is too short (minimum is #{APIUser.min_password_length} characters)",
+        "Password is too short (minimum is #{ApiUser.min_password_length} characters)",
         "Registrar Registrar is missing",
         "Username Username is missing",
         "Roles is missing"

spec/models/domain_spec.rb

@@ -316,10 +316,10 @@ RSpec.describe Domain do
           @api_user = create(:api_user)
           @user.id.should == 1
           @api_user.id.should == 2
-          ::PaperTrail.whodunnit = '2-APIUser: testuser'
+          ::PaperTrail.whodunnit = '2-ApiUser: testuser'
 
           @domain = create(:domain)
-          @domain.creator_str.should == '2-APIUser: testuser'
+          @domain.creator_str.should == '2-ApiUser: testuser'
 
           @domain.creator.should == @api_user
           @domain.creator.should_not == @user

spec/presenters/user_presenter_spec.rb

@@ -4,7 +4,7 @@ RSpec.describe UserPresenter do
   let(:presenter) { described_class.new(user: user, view: view) }
 
   describe '#login_with_role' do
-    let(:user) { instance_double(APIUser,
+    let(:user) { instance_double(ApiUser,
                                  login: 'login',
                                  roles: %w[role],
                                  registrar_name: 'registrar') }