Split out css for new PresenceLabel

src/skins/vector/css/matrix-react-sdk/views/rooms/MemberTile.css

@@ -60,11 +60,6 @@ limitations under the License.
     text-overflow: ellipsis;
 }
 
-.mx_MemberTile_presence {
-    font-size: 11px;
-    opacity: 0.5;
-}
-
 .mx_MemberTile_chevron {
     margin-top: 8px;
     margin-right: -4px;

src/skins/vector/css/matrix-react-sdk/views/rooms/PresenceLabel.css

@@ -0,0 +1,20 @@
+/*
+Copyright 2015, 2016 OpenMarket Ltd
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+.mx_PresenceLabel {
+    font-size: 11px;
+    opacity: 0.5;
+}