Forget room when leaving

Also, don't flicker "join" view when knock is accepted. Issues #651 and #653

src/components/UserProfileDialog.vue

@@ -1,6 +1,7 @@
 <template>
   <v-dialog
     v-model="showDialog"
+    v-bind="{ ...$attrs }"
     class="ma-0 pa-0"
     :width="$vuetify.display.smAndUp ? '688px' : '95%'"
     scroll-strategy="none"
@@ -36,7 +37,6 @@
           <p class="font-weight-light">{{ sharedRooms.slice(0, 3).join(", ") }}</p>
         </template>
       </div>
-      {{ message }}
       <DeviceList :member="activeMember" />
       <div class="py-3" v-if="activeMember.userId != $matrix.currentUserId">
         <div v-if="activeMember.membership == 'knock'">