Update test since branch removal does not render template anymore

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

spec/controllers/projects/branches_controller_spec.rb

@@ -122,27 +122,23 @@ describe Projects::BranchesController do
       let(:branch) { "feature" }
 
       it { expect(response.status).to eq(200) }
-      it { expect(subject).to render_template('destroy') }
     end
 
     context "valid branch name with unencoded slashes" do
       let(:branch) { "improve/awesome" }
 
       it { expect(response.status).to eq(200) }
-      it { expect(subject).to render_template('destroy') }
     end
 
     context "valid branch name with encoded slashes" do
       let(:branch) { "improve%2Fawesome" }
 
       it { expect(response.status).to eq(200) }
-      it { expect(subject).to render_template('destroy') }
     end
     context "invalid branch name, valid ref" do
       let(:branch) { "no-branch" }
 
       it { expect(response.status).to eq(404) }
-      it { expect(subject).to render_template('destroy') }
     end
   end
 end