Remove dm user option

- I don't know why but I thought .../open-room/<user_id> would open an
  invite view to a room with the specified user.
- Does not work like that, so removed.

Signed-off-by: RMidhunSuresh <rmidhunsuresh@gmail.com>

src/domain/session/rightpanel/MemberDetailsViewModel.js

@@ -75,10 +75,6 @@ export class MemberDetailsViewModel extends ViewModel {
         return this._isEncrypted;
     }
 
-    get dmLink() {
-        return `${this.urlCreator.urlUntilSegment("session")}/open-room/${this._member.userId}`;
-    }
-
     get linkToUser() {
         return `https://matrix.to/#/${this._member.userId}`;
     }

src/platform/web/ui/session/rightpanel/MemberDetailsView.js

@@ -47,7 +47,6 @@ export class MemberDetailsView extends TemplateView {
                 t.div({className: "MemberDetailsView_label"}, vm.i18n`OPTIONS`),
                 t.div({className: "MemberDetailsView_options"},
                     [
-                        t.a({href: vm.dmLink}, vm.i18n`Direct Message`),
                         t.a({href: vm.linkToUser, target: "_blank", rel: "noopener"}, vm.i18n`Open Link to User`)
                     ])
             ]);