Fix spool file in sidebar, and redraw sidebar on account switch

roles/neomutt/templates/account.neomuttrc.j2

@@ -31,6 +31,8 @@ set record = "{{ account.other_vars.record | default('+Sent') }}"
 set postponed = "{{ account.other_vars.postponed | default('+Drafts') }}"
 set trash = "{{ account.other_vars.trash | default('+Trash') }}"
 set imap_check_subscribed
+unmailboxes *
+mailboxes "{{ account.other_vars.spool_file | default('=INBOX') }}"
 
 set ssl_starttls = yes
 set ssl_force_tls = yes