Activate backlogs attributes in WP overview
Fix indentation
Enable backlogs attributes in API v3
Check project for backlogs module

The hook is called from the OP core's work package controller index
method. For index no specific WP is selected. Thus, we must use the
selected project to check if the backlogs module is activated.
Merge pull request #106 from finnlabs/feature/14007_show_backlogs_attributes_in_overview_tab

[Feature] 14007 show backlogs attributes in overview tab