Remove rate correction factor.
Removed an adaptive rate correction factor that was having a negative impact on quality in many clips. This factor was influencing the Q range available to each frame independently of the bits allocated to each. Average results with DISABLE_RC_LONG_TERM_MEM. derf +0.199, -0.059. yt +3.957, +3.798 std hd +1.577, +2.140 yt hd +4.127, +4.513 Average results without DISABLE_RC_LONG_TERM_MEM derf -0.628, -0.665 yt +3.432, +3.015 std hd -0.105, +0.153 yt hd +3.432, +3.015 Change-Id: I45bab6b606f49a442e7b27a6d631f3ffd843bbce