php.composer requires interaction for latest versions

The upgrade of Composer now requires interaction from the user when running as root, this causes the web states to never complete.

• GitHub issue: https://github.com/saltstack-formulas/php-formula/issues/219
• Sample workaround: https://github.com/caess/php-formula/commit/f860f2a27b2111116203f678d048f0a085191cf9

For now disabling the installation of Composer should fix this issue until the problem is fixed upstream.