Handle JSX in MELS

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

src/components/views/elements/EventListSummary.tsx

@@ -33,7 +33,7 @@ interface IProps {
     // The list of room members for which to show avatars next to the summary
     summaryMembers?: RoomMember[];
     // The text to show as the summary of this event list
-    summaryText?: string;
+    summaryText?: string | JSX.Element;
     // An array of EventTiles to render when expanded
     children: ReactNode[];
     // Called when the event list expansion is toggled