correctly consider php_packages variable when using with geerlingguy.php

[aft2d]

If php_packages is set on task level like

block:
- include_role:
name: php-versions
- include_role:
name: geerlingguy.php
vars:
php_version: "7.3"
php_versions_install_recommends: false
php_enable_webserver: false
php_packages_state: "present"
php_install_recommends: false
php_enable_php_fpm: false
php_enable_apc: false
php_packages:
- php7.3-common
- php7.3-cli
- php7.3-zip
- php7.3-curl
- php7.3-mbstring

or in a var file etc. the module overwrites php_packages which is used in the geerlingguy.php role.

This PR checks if the variable is set in general and not only on the host level.

[webarchitect609]

@aft2d, thank you for this fix! I used it in my fork webarchitect609.php_versions. Please, feel free to use, if you still need it.

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[stale]

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