Add composer controls wrapper to set correct width on the composer controls wrapper div

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

@@ -37,6 +37,10 @@ limitations under the License.
     display: block;
 }
 
+.mx_MessageComposer_composecontrols {
+    width: 100%;
+}
+
 .mx_MessageComposer_noperm_error {
     display: table-cell;
     width: 100%;