[bash] Add --sync to the default CTRL-R options
[bash] Add --sync to the default CTRL-R options

This compensates the use of --tac. fzf will not render on the screen
until the complete list of commands are loaded.

stuha/wbr-zsh,infokiller/fzf,janlazo/fzf,janlazo/fzf,wilywampa/fzf,junegunn/fzf,junegunn/fzf,janlazo/fzf,infokiller/fzf,wilywampa/fzf,infokiller/fzf,wilywampa/fzf,junegunn/fzf