Re-enable bmo nag with zbmo implementation

dotfiles/config/bashum/head.bashrc

 mkdir -p /var/tmp/bashum-rv
 
 BASHUM_TASK_CTX=false
-BASHUM_BMO_NAG=false
+BASHUM_BMO_NAG=true
 
 for include in \
   "${HOME}/.config/bashum/colors.bashrc" \

dotfiles/config/bashum/post.bashrc

 
 PROMPT_COMMAND=$(__bashum__mkpc)
 
-$BASHUM_BMO_NAG && bmo nag
+$BASHUM_BMO_NAG && zbmo nag