Don't use a spacer

Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>

src/toasts/IncomingCallToast.tsx

@@ -125,7 +125,6 @@ export default class IncomingCallToast extends React.Component<IProps, IState> {
                 >
                     { _t("Decline") }
                 </AccessibleButton>
-                <div className="mx_IncomingCallToast_spacer" />
                 <AccessibleButton
                     className="mx_IncomingCallToast_accept"
                     onClick={this.onAnswerClick}