Fix scrollbar for pills with initial avatar

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

@@ -105,6 +105,7 @@ limitations under the License.
 
 .mx_MessageComposer_input .public-DraftEditor-content {
     max-height: 120px;
+    min-height: 21px;
     overflow: auto;
 }