avoid hoverover artefacts on avatar initials

src/skins/vector/css/atoms/MemberAvatar.css

@@ -23,6 +23,7 @@ limitations under the License.
     color: #fff;
     text-align: center;
     speak: none;
+    pointer-events: none;
 }
 
 .mx_MemberAvatar_image {

src/skins/vector/css/atoms/RoomAvatar.css

@@ -23,4 +23,5 @@ limitations under the License.
     text-align: center;
     font-weight: normal ! important;
     speak: none;
+    pointer-events: none;
 }