qos-scripts: remove maxsize options and packet size based reclassify from the default config

They should be unnecessary with fq_codel, and simplifying rules helps
with performance

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@41549 3c298f89-4303-0410-b956-a3cf2f4a3e73