filters: put libexec/filters dirs before default PATH

Some distro packages install binaries in /usr/bin that clash with some
of aerc's builtin filters (for example, colorize and wrap). The issue is
that aerc filters dir (usually /usr/libexec/aerc/filters) is *after*
/usr/bin, making the builtin filters not accessible when these distro
packages are installed.

Since this mostly concerns colorize and wrap, move $LIBEXEC/aerc/filters
at the beginning of the exec PATH when running filter commands. If the
intent is **really** to execute /usr/bin/colorize or /usr/bin/html, then
their absolute paths should be used.

Link: https://archlinux.org/packages/extra/x86_64/talkfilters/
Link: https://tracker.debian.org/pkg/colorize
Signed-off-by: Robin Jarry <robin@jarry.cc>
Reviewed-by: Tristan Partin <tristan@partin.io>

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