Allow join/leave in platform mode

src/app/components/MenuSpace.svelte

@@ -21,7 +21,6 @@
     memberships,
     roomsByUrl,
     GENERAL,
-    PLATFORM_RELAY,
   } from "@app/state"
   import {checkRelayConnection, checkRelayAuth} from "@app/commands"
   import {pushModal} from "@app/modal"
@@ -98,7 +97,6 @@
               Create Invite
             </Button>
           </li>
-          {#if !PLATFORM_RELAY}
           <li>
             {#if getMembershipUrls($userMembership).includes(url)}
               <Button on:click={leaveSpace} class="text-error">
@@ -112,7 +110,6 @@
               </Button>
             {/if}
           </li>
-          {/if}
         </ul>
       </Popover>
     {/if}