Fix undefined method avatar_path in geo specs

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

spec/models/group_spec.rb

@@ -259,6 +259,7 @@ describe Group do
       end
 
       context 'when in a geo secondary node' do
+        let(:avatar_path) { group.avatar_path(only_path: true) }
         let(:geo_host) { 'http://geo.example.com' }
         let(:geo_avatar_url) { [geo_host, avatar_path].join }
 

spec/models/project_spec.rb

@@ -1023,6 +1023,7 @@ describe Project do
 
       context 'When in a geo secondary node' do
         let(:geo_url) { 'http://geo.example.com' }
+        let(:avatar_path) { project.avatar_path(only_path: true) }
 
         before do
           allow(Gitlab::Geo).to receive(:secondary?) { true }

spec/models/user_spec.rb

@@ -1183,6 +1183,7 @@ describe User do
       end
 
       context 'when in a geo secondary node' do
+        let(:avatar_path) { user.avatar_path(only_path: true) }
         let(:geo_host) { 'http://geo.example.com' }
         let(:geo_avatar_url) { [geo_host, avatar_path].join }