fix wiki path issues and spec

app/services/projects/import_export/repo_bundler.rb

@@ -27,7 +27,7 @@ module Projects
       end
       def project_filename
-        "#{@project.namespace}#{@project.name}.bundle"
+        "#{@project.name}.bundle"
       end
       def path_to_repo

app/services/projects/import_export/wiki_repo_bundler.rb

@@ -18,6 +18,10 @@ module Projects
       private
+      def project_filename
+        "#{@project.name}.wiki.bundle"
+      end
+
       def path_to_repo
         @wiki.repository.path_to_repo
       end

spec/services/projects/import_export/wiki_repo_bundler_spec.rb

@@ -8,10 +8,13 @@ describe Projects::ImportExport::WikiRepoBundler, services: true do
     let(:export_path) { "#{Dir::tmpdir}/project_tree_saver_spec" }
     let(:shared) { Projects::ImportExport::Shared.new(relative_path: project.path_with_namespace) }
     let(:wiki_bundler) { Projects::ImportExport::WikiRepoBundler.new(project: project, shared: shared) }
+    let!(:project_wiki) { ProjectWiki.new(project, user) }
     before(:each) do
       project.team << [user, :master]
       allow_any_instance_of(Projects::ImportExport).to receive(:storage_path).and_return(export_path)
+      project_wiki.wiki
+      project_wiki.create_page("index", "test content")
     end
     after(:each) do