Remove LDAP save test

This is handled within the LDAP class

spec/lib/gitlab/oauth/user_spec.rb

@@ -29,14 +29,14 @@ describe Gitlab::OAuth::User do
   end
 
   describe :save do
-    context "LDAP" do
-      let(:provider) { 'ldap' }
-      it "creates a user from LDAP" do
+    let(:provider) { 'twitter' }
+
+    it "creates a user from Omniauth" do
       oauth_user.save
 
       expect(gl_user).to be_valid
       expect(gl_user.extern_uid).to eql uid
-        expect(gl_user.provider).to eql 'ldap'
+      expect(gl_user.provider).to eql 'twitter'
     end
   end