Adding db_adapter to fix error:

*ERROR> Execution error:
Unrecognized database adapter , exiting

The error occurred line 65 of [COOKBOOKS]//default/7b7437c7606659f5ef8041245bac965c/cookbooks/app_nginx_php/recipes/default.rb in method 'from_file' while executing:

63     ]
64   else
**     raise "Unrecognized database adapter #{node[:app_php][:db_adapter]}, exiting "
66   end
67 else