Don't open new tab for false positive scanner result report (#20261)

Fix https://github.com/mozilla/addons-server/issues/20260

src/olympia/scanners/templates/admin/scannerresult_actions.html

@@ -5,7 +5,6 @@
   <button
     class="button report-false-positive-button"
     formaction="{% url handlefalsepositive_urlname obj.pk %}"
-    formtarget="_blank"
   >
     False positive
   </button>

src/olympia/scanners/templates/admin/scanners/scannerresult/change_form.html

@@ -1,8 +0,0 @@
-{% extends 'admin/change_form.html' %}
-{% load static admin_urls %}
-
-{% block admin_change_form_document_ready %}
-  {{ block.super }}
-
-  <script type="text/javascript" src="{% static 'js/scanners/scannerresult_actions.js' %}"></script>
-{% endblock %}

src/olympia/scanners/templates/admin/scanners/scannerresult/change_list.html

@@ -1,8 +0,0 @@
-{% extends "admin/change_list.html" %}
-{% load static %}
-
-{% block footer %}
-  {{ block.super }}
-
-  <script type="text/javascript" src="{% static 'js/scanners/scannerresult_actions.js' %}"></script>
-{% endblock %}

static/js/scanners/scannerresult_actions.js

@@ -1,7 +0,0 @@
-document.querySelectorAll('.report-false-positive-button').forEach((button) => {
-  button.addEventListener('click', () => {
-    setTimeout(() => {
-      window.location.reload();
-    }, 2000); // 2 seconds
-  });
-});