[api] fix the database corruption on our life instance, we learned th…

…at using "find_all_" is dangerous

src/api/app/models/db_project.rb

@@ -465,7 +465,7 @@ def store_axml( project, force=nil )
       # The attribute 'type' is only set for maintenance and maintenance incident projects.
       kind_element = project.value(:kind)
       # First remove all maintained project relations
-      DbProject.find_all_by_maintenance_project_id(self.id).each do |maintained_project|
+      maintained_projects.each do |maintained_project|
         maintained_project.maintenance_project_id = nil
         maintained_project.save!
       end