Minify AutoCSS/AutoJS htaccess header link cleanup for Page Cache

[cssjoe]

If Page Cache and Minify Auto are enabled and then Minify is disabled, there are "Header add Link" lines that remain in "wp-content/cache/page_enhanced/.htaccess". This causes browsers to load CSS and JS files that no longer exist.

The issue appears to be resolved if the exclude in https://github.com/BoldGrid/w3-total-cache/blob/2.4.1/PgCache_Plugin_Admin.php#L94 is removed, but may break other functionality.

The lines are added by https://github.com/BoldGrid/w3-total-cache/blob/2.4.1/Minify_AutoCss.php#L296-L299 and https://github.com/BoldGrid/w3-total-cache/blob/2.4.1/Minify_AutoJs.php#L323-L326.

The Page Cache cleaner process is already slow, so we don't want to add more time to the process, but we should weigh the options.