Put tooltips on presence consistently

Sort out duplication between presence icon code, have the MemberIconView
position the presence icon rather than the presence icon trying to position
itself.

apps/web/res/css/views/avatars/_WithPresenceIndicator.pcss

@@ -13,10 +13,7 @@ Please see LICENSE files in the repository root for full details.
 
     .mx_WithPresenceIndicator_icon {
         position: absolute;
-        /* PresenceIconView has its own idea of where it should be positioned which it probably shouldn't */
-        top: initial;
-        left: initial;
-        right: -2px;
-        bottom: -2px;
+        right: 0px;
+        bottom: 2px;
     }
 }

apps/web/res/css/views/rooms/_MemberTileView.pcss

@@ -41,4 +41,10 @@ Please see LICENSE files in the repository root for full details.
         height: 32px;
         width: 32px;
     }
+
+    .mx_MemberTileView_presence {
+        position: absolute;
+        right: -2px;
+        bottom: 2px;
+    }
 }

apps/web/res/css/views/rooms/_PresenceIconView.pcss

@@ -6,11 +6,6 @@ Please see LICENSE files in the repository root for full details.
 */
 
 .mx_PresenceIconView {
-    position: absolute;
-    top: 24px;
-    left: 24px;
-    width: 12px;
-    height: 12px;
     display: flex;
     justify-content: center;
     align-items: center;