Fix incorrect module name in apache.conf

Harish Rajagopalrequested to merge
rharish/php-legacy:conf_module_name_fix into main

Resolves #1.

The module name is php_module, not php-legacy_module. This was causing that config file not to be picked up. For example, due to the missing DirectoryIndex, index.php files weren't being automatically shown when entering a directory URL.

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