[shell] Revert interactiveness checks for eval

So that there's no error even when the scripts are mistakenly evaluated
in non-interactive sessions.

  bash -c 'eval "$(fzf --bash)"; echo done'
  zsh -c 'eval "$(fzf --zsh)"; echo done'

* https://github.com/junegunn/fzf/pull/3675#issuecomment-2044860901
* f103aa4753

shell/key-bindings.bash

@@ -11,7 +11,7 @@
 # - $FZF_ALT_C_COMMAND
 # - $FZF_ALT_C_OPTS
 
-[[ $- =~ i ]] || return 0
+if [[ $- =~ i ]]; then
 
 
 # Key bindings
@@ -132,3 +132,5 @@ if [[ "${FZF_ALT_C_COMMAND-x}" != "" ]]; then
   bind -m vi-command '"\ec": "\C-z\ec\C-z"'
   bind -m vi-insert '"\ec": "\C-z\ec\C-z"'
 fi
+
+fi