Remove a redundant call of av1_init_plane_quantizers()
Remove a redundant call of av1_init_plane_quantizers()

With aq_mode=VARIANCE_AQ, the av1_init_plane_quantizers() is
called in set_segment_rdmult().

Change-Id: Id2584a0544ee633832b844ba06c137236068c4b9

GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom