Remove `IfModule mod_filter.c` check from htaccess
Remove `IfModule mod_filter.c` check from htaccess

We currently use Apache v2.2.22-14, so the `<IfModule mod_filter.c>`
check isn't necessary. In addition to this, because `mod_filter` isn't
enabled on the server, the check also prevents Apache for compressing
the files.

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