FIX: Users can't request to join group due to alias level restriction.

https://meta.discourse.org/t/request-to-join-group-not-working/62371

app/assets/javascripts/discourse/components/group-membership-button.js.es6

@@ -8,11 +8,6 @@ export default Ember.Component.extend({
     return publicGroup;
   },
 
-  @computed('model.allow_membership_requests', 'model.alias_level')
-  canRequestMembership(allowMembershipRequests, aliasLevel) {
-    return allowMembershipRequests && aliasLevel === 99;
-  },
-
   @computed("model.is_group_user", "model.id", "groupUserIds")
   userIsGroupUser(isGroupUser, groupId, groupUserIds) {
     if (isGroupUser !== undefined) {

app/assets/javascripts/discourse/templates/components/group-membership-button.hbs

@@ -12,7 +12,7 @@
         label="groups.join"
         disabled=updatingMembership}}
   {{/if}}
-{{else if canRequestMembership}}
+{{else if model.allow_membership_requests}}
   {{#if userIsGroupUser}}
     {{#if showMembershipStatus}}
       {{d-button

test/javascripts/components/group-membership-button-test.js.es6

@@ -18,24 +18,6 @@ test('canJoinGroup', function() {
   equal(this.subject().get("canJoinGroup"), true, "can't join group when not logged in");
 });
 
-test('canRequestMembership', function() {
-  this.subject().setProperties({
-    model: { allow_membership_requests: false, alias_level: 0 }
-  });
-
-  equal(this.subject().get('canRequestMembership'), false);
-
-  this.subject().setProperties({
-    currentUser: currentUser(), model: { allow_membership_requests: true, alias_level: 99 }
-  });
-
-  equal(this.subject().get('canRequestMembership'), true);
-
-  this.subject().set("model.alias_level", 0);
-
-  equal(this.subject().get('canRequestMembership'), false);
-});
-
 test('userIsGroupUser', function() {
   this.subject().setProperties({
     model: { is_group_user: true }