Skip zsh doctor in non-interactive shells (#1241)

Co-authored-by: Puneet Dixit <236133619+puneetdixit200@users.noreply.github.com>
Co-authored-by: Ajeet D'Souza <98ajeet@gmail.com>

templates/zsh.txt

@@ -59,6 +59,7 @@ function __zoxide_doctor() {
 
 {%- else %}
     [[ ${_ZO_DOCTOR:-1} -ne 0 ]] || return 0
+    [[ $- == *i* ]] || return 0
 
 {%- if hook == InitHook::Prompt %}
     [[ ${precmd_functions[(Ie)__zoxide_hook]:-} -eq 0 ]] || return 0