Remove outdated flash message

Managed repositories are always deleted, even if the configuration
states otherwise.

The specific flash message concerning deletion of managed repositories
is thus wrong and was removed.

app/controllers/repositories_controller.rb

@@ -109,13 +109,8 @@ class RepositoriesController < ApplicationController
   end
 
   def destroy
-    if @project.repository.manageable?
-      flash[:notice] = I18n.t('repositories.delete_sucessful')
-    else
-      flash[:warning] = I18n.t('repositories.errors.unlink_failed_unmanageable')
-    end
-
     @project.repository.destroy
+    flash[:notice] = I18n.t('repositories.delete_sucessful')
     redirect_to settings_repository_tab_path
   end
 

config/locales/en.yml

@@ -1267,7 +1267,6 @@ en:
       path_permission_failed: "An error occurred trying to create the following path: %{path}. Please ensure that OpenProject may write to that folder."
       unauthorized: "You're not authorized to access the repository or the credentials are invalid."
       unavailable: "The repository is unavailable."
-      unlink_failed_unmanageable: "The repository was deleted, but its directory could not be removed, because it is no longer manageable by OpenProject."
       exception_title: "Cannot access the repository: %{message}"
       disabled_or_unknown_type: "The selected type %{type} is disabled or no longer available for the SCM vendor %{vendor}."
       disabled_or_unknown_vendor: "The SCM vendor %{vendor} is disabled or no longer available."