FIX: Allow group members to freely exit group option incorrectly disabled.

https://meta.discourse.org/t/cannot-check-allow-members-to-leave-group-freely-when-group-is-configured-to-allow-users-to-send-membership-requests-to-group-owners/73400

app/assets/javascripts/discourse/templates/group-edit.hbs

@@ -33,8 +33,7 @@
       <label>
         {{input type='checkbox'
             checked=model.public_exit
-            class="group-edit-public-exit"
-            disabled=model.allow_membership_requests}}
+            class="group-edit-public-exit"}}
 
         {{i18n 'groups.public_exit'}}
       </label>

test/javascripts/acceptance/group-edit-test.js.es6

@@ -43,6 +43,11 @@ QUnit.test("Editing group", assert => {
       'it should disable group public admission input'
     );
 
+    assert.ok(
+      find('.group-edit-public-exit[disabled]').length === 0,
+      'it should not disable group public exit input'
+    );
+
     assert.equal(
       find('.group-edit-membership-request-template').length, 1,
       'it should display the membership request template field'

test/javascripts/fixtures/group-fixtures.js.es6

@@ -9,7 +9,7 @@ export default {
       "alias_level":99,
       "visible":true,
       "public_admission":true,
-      "public_exit":true,
+      "public_exit":false,
       "flair_url": 'fa-adjust',
       "is_group_owner":true,
       "mentionable":true,