Remove relayoutOnUpdate prop on gemini-scrollbar

The latest gemini-scrollbar makes relayoutOnUpdate redundant, so update to it
and remove the properties.

src/components/views/rooms/MemberList.js

@@ -521,7 +521,6 @@ module.exports = React.createClass({
             <div className="mx_MemberList">
                     {inviteMemberListSection}
                     <GeminiScrollbar autoshow={true}
-                                     relayoutOnUpdate={false}
                                      className="mx_MemberList_joined mx_MemberList_outerWrapper">
                         <TruncatedList className="mx_MemberList_wrapper" truncateAt={this.state.truncateAt}
                                 createOverflowElement={this._createOverflowTile}>

src/components/views/rooms/RoomList.js

@@ -325,7 +325,6 @@ module.exports = React.createClass({
 
         return (
             <GeminiScrollbar className="mx_RoomList_scrollbar"
-                 relayoutOnUpdate={false}
                  autoshow={true} onScroll={ self._repositionTooltips } ref="gemscroll">
             <div className="mx_RoomList">
                 <RoomSubList list={ self.state.lists['im.vector.fake.invite'] }

src/components/views/rooms/SearchableEntityList.js

@@ -179,7 +179,6 @@ var SearchableEntityList = React.createClass({
             }
             list = (
                 <GeminiScrollbar autoshow={true}
-                                 relayoutOnUpdate={false}
                                  className="mx_SearchableEntityList_listWrapper">
                     { list }
                 </GeminiScrollbar>