Fix import pages not working after first load.

CHANGELOG

@@ -61,6 +61,7 @@ v 7.9.0 (unreleased)
   - Allow smb:// links in Markdown text.
   - Filter merge request by title or description at Merge Requests page
   - Block user if he/she was blocked in Active Directory
+  - Fix import pages not working after first load.
 
 v 7.8.4
   - Fix issue_tracker_id substitution in custom issue trackers

lib/gitlab/bitbucket_import/client.rb

@@ -92,7 +92,7 @@ module Gitlab
       end
 
       def bitbucket_options
-        OmniAuth::Strategies::Bitbucket.default_options[:client_options]
+        OmniAuth::Strategies::Bitbucket.default_options[:client_options].dup
       end
     end
   end

lib/gitlab/github_import/client.rb

@@ -46,7 +46,7 @@ module Gitlab
       end
 
       def github_options
-        OmniAuth::Strategies::GitHub.default_options[:client_options]
+        OmniAuth::Strategies::GitHub.default_options[:client_options].dup
       end
     end
   end

lib/gitlab/gitlab_import/client.rb

@@ -71,7 +71,7 @@ module Gitlab
       end
 
       def gitlab_options
-        OmniAuth::Strategies::GitLab.default_options[:client_options]
+        OmniAuth::Strategies::GitLab.default_options[:client_options].dup
       end
     end
   end