Increase readability of image controller spec

Best viewed without whitespace changes.

- Decrease indent.
- Move `let` to top like in other specs.
- Avoid `let!` to speed up the specs.

spec/controllers/api/v0/product_images_controller_spec.rb

@@ -2,37 +2,37 @@
 
 require 'spec_helper'
 
-module Api
-  describe V0::ProductImagesController, type: :controller do
-    include AuthenticationHelper
-    include FileHelper
-    render_views
+describe Api::V0::ProductImagesController, type: :controller do
+  include AuthenticationHelper
+  include FileHelper
+  render_views
 
-    describe "uploading an image" do
-      before do
-        allow(controller).to receive(:spree_current_user) { current_api_user }
-      end
+  describe "uploading an image" do
+    let(:image) { Rack::Test::UploadedFile.new(black_logo_file, 'image/png') }
+    let(:product_without_image) { create(:product) }
+    let(:product_with_image) { create(:product_with_image) }
+    let(:current_api_user) { create(:admin_user) }
 
-      let(:image) { Rack::Test::UploadedFile.new(black_logo_file, 'image/png') }
-      let!(:product_without_image) { create(:product) }
-      let!(:product_with_image) { create(:product_with_image) }
-      let(:current_api_user) { create(:admin_user) }
+    before do
+      allow(controller).to receive(:spree_current_user) { current_api_user }
+    end
 
-      it "saves a new image when none is present" do
-        post :update_product_image, xhr: true,
-                                    params: { product_id: product_without_image.id, file: image, use_route: :product_images }
+    it "saves a new image when none is present" do
+      post :update_product_image, xhr: true, params: {
+        product_id: product_without_image.id, file: image, use_route: :product_images
+      }
 
-        expect(response.status).to eq 201
-        expect(product_without_image.images.first.id).to eq json_response['id']
-      end
+      expect(response.status).to eq 201
+      expect(product_without_image.images.first.id).to eq json_response['id']
+    end
 
-      it "updates an existing product image" do
-        post :update_product_image, xhr: true,
-                                    params: { product_id: product_with_image.id, file: image, use_route: :product_images }
+    it "updates an existing product image" do
+      post :update_product_image, xhr: true, params: {
+        product_id: product_with_image.id, file: image, use_route: :product_images
+      }
 
-        expect(response.status).to eq 200
-        expect(product_with_image.images.first.id).to eq json_response['id']
-      end
+      expect(response.status).to eq 200
+      expect(product_with_image.images.first.id).to eq json_response['id']
     end
   end
 end