Fix bug in install script

install

@@ -72,7 +72,7 @@ for shell in bash zsh; do
   echo -n "Generate ~/.fzf.$shell ... "
   src=~/.fzf.${shell}
 
-  fzf_completion="source $fzf_base/fzf-completion.${shell}"
+  fzf_completion="[[ \$- =~ i ]] && source $fzf_base/fzf-completion.${shell}"
   if [ $auto_completion -ne 0 ]; then
     fzf_completion="# $fzf_completion"
   fi
@@ -88,7 +88,7 @@ export -f fzf > /dev/null
 
 # Auto-completion
 # ---------------
-[[ \$- =~ i ]] && $fzf_completion
+$fzf_completion
 
 EOF