fix: Disable Bash macro chain when no binding enabled (#2969)

If the user is not binding any commands, then there is no need to do
the macro chain workaround.  This causes issues if the user
deliberately disabled the bindings because their Bash session does not
have the line editor enabled; this macro chain binding will then cause
errors.

Author: darkfeline

crates/atuin/src/shell/atuin.bash

@@ -386,11 +386,14 @@ __atuin_widget_run() {
 # The number <n> is fixed to be 1 in the input stream, so we may use <n> = 0
 # (which is unlikely be used) as our special key sequences.
 
-__atuin_macro_chain='\e[0;0A'
-for __atuin_keymap in emacs vi-insert vi-command; do
-    bind -m "$__atuin_keymap" "\"$__atuin_macro_chain\": \"\""
-done
-unset -v __atuin_keymap
+# shellcheck disable=SC2154
+if [[ $__atuin_bind_ctrl_r == true || $__atuin_bind_up_arrow == true ]]; then
+    __atuin_macro_chain='\e[0;0A'
+    for __atuin_keymap in emacs vi-insert vi-command; do
+        bind -m "$__atuin_keymap" "\"$__atuin_macro_chain\": \"\""
+    done
+    unset -v __atuin_keymap
+fi
 
 if ((BASH_VERSINFO[0] >= 5 || BASH_VERSINFO[0] == 4 && BASH_VERSINFO[1] >= 3)); then
     # In Bash >= 4.3