ref: Remove dead template (#82524)

This file doesn't seem to be referenced by any Python or HTML file which
means it is dead. Let's remove it.

src/sentry/templates/sentry/bases/forceauth_modal.html

@@ -1,11 +0,0 @@
-{% extends "sentry/layout.html" %}
-
-{% load i18n %}
-
-{% block wrapperclass %}{{ block.super }} narrow hide-sidebar{% endblock %}
-
-{% block content %}
-  <p><strong>Account</strong>: {{ request.user.get_display_name }}</p>
-  <hr>
-  {% block main %}{% endblock %}
-{% endblock %}