erts: Fix bug in erts_bs_private_append
erts: Fix bug in erts_bs_private_append

PB_ACTIVE_WRITER was set without PB_IS_WRITABLE

bjorng/otp,isvilen/otp,mikpe/otp,emacsmirror/erlang,erlang/otp,emacsmirror/erlang,isvilen/otp,vinoski/otp,emacsmirror/erlang,potatosalad/otp,g-andrade/otp,g-andrade/otp,rlipscombe/otp,potatosalad/otp,dumbbell/otp,g-andrade/otp,vinoski/otp,jj1bdx/otp,jj1bdx/otp,mikpe/otp,dgud/otp,mikpe/otp,emacsmirror/erlang,bjorng/otp,mikpe/otp,bjorng/otp,rlipscombe/otp,dgud/otp,mikpe/otp,emacsmirror/erlang,getong/otp,bjorng/otp,dumbbell/otp,rlipscombe/otp,vinoski/otp,dgud/otp,rlipscombe/otp,dgud/otp,emacsmirror/erlang,potatosalad/otp,erlang/otp,getong/otp,erlang/otp,potatosalad/otp,erlang/otp,getong/otp,isvilen/otp,isvilen/otp,dumbbell/otp,potatosalad/otp,vinoski/otp,dgud/otp,vinoski/otp,getong/otp,bjorng/otp,getong/otp,getong/otp,mikpe/otp,jj1bdx/otp,vinoski/otp,vinoski/otp,dgud/otp,erlang/otp,getong/otp,jj1bdx/otp,erlang/otp,rlipscombe/otp,mikpe/otp,vinoski/otp,getong/otp,g-andrade/otp,jj1bdx/otp,isvilen/otp,erlang/otp,g-andrade/otp,isvilen/otp,jj1bdx/otp,potatosalad/otp,erlang/otp,emacsmirror/erlang,g-andrade/otp,mikpe/otp,dumbbell/otp,rlipscombe/otp,dgud/otp,isvilen/otp,erlang/otp,rlipscombe/otp,bjorng/otp,isvilen/otp,bjorng/otp,jj1bdx/otp,dumbbell/otp,emacsmirror/erlang,g-andrade/otp,dgud/otp,mikpe/otp,g-andrade/otp,dgud/otp,getong/otp,isvilen/otp,rlipscombe/otp,g-andrade/otp,emacsmirror/erlang,potatosalad/otp,bjorng/otp,erlang/otp,jj1bdx/otp,vinoski/otp,g-andrade/otp,dgud/otp,potatosalad/otp,dumbbell/otp,mikpe/otp,isvilen/otp,vinoski/otp,dumbbell/otp,dumbbell/otp,potatosalad/otp,emacsmirror/erlang,potatosalad/otp,jj1bdx/otp,jj1bdx/otp,rlipscombe/otp,bjorng/otp,rlipscombe/otp,getong/otp,dumbbell/otp,dumbbell/otp,bjorng/otp