Scripts folder fix

[talek]

PR #504 is breaking some of my playbooks:

TASK [opitzconsulting.ansible_oracle.oradb_manage_db : manage_db | Add change-pdb script] ***                                                                                                       
fatal: [moo]: FAILED! => {"msg": "The task includes an option with an undefined variable. The error was: 'scripts_folder' is undefined. 'scripts_folder' is undefined\n\nThe error appears to be in 
'/Users/talek/.ansible/collections/ansible_collections/opitzconsulting/ansible_oracle/roles/oradb_manage_db/tasks/main.yml': line 65, column 3, but may\nbe elsewhere in the file depending on the e
xact syntax problem.\n\nThe offending line appears to be:\n\n\n- name: manage_db | Add change-pdb script\n  ^ here\n"}                                                                              

The reason is that the new scripts_folder variable is defined in the common role which is not a dependent role for any of the oradb_manage_db nor oraswdb_install roles. A better place to have this variable defined is orahost_meta. This PR addresses this issue.