Remove relayoutOnUpdate prop on gemini-scrollbar

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

package.json

@@ -39,7 +39,7 @@
     "extract-text-webpack-plugin": "^0.9.1",
     "filesize": "^3.1.2",
     "flux": "~2.0.3",
-    "gemini-scrollbar": "matrix-org/gemini-scrollbar#468544d",
+    "gemini-scrollbar": "matrix-org/gemini-scrollbar#b302279",
     "gfm.css": "^1.1.1",
     "highlight.js": "^9.0.0",
     "linkifyjs": "^2.0.0-beta.4",
@@ -51,7 +51,7 @@
     "react-dnd": "^2.1.4",
     "react-dnd-html5-backend": "^2.1.2",
     "react-dom": "^15.2.1",
-    "react-gemini-scrollbar": "matrix-org/react-gemini-scrollbar#dbf0abf",
+    "react-gemini-scrollbar": "matrix-org/react-gemini-scrollbar#5e97aef",
     "sanitize-html": "^1.11.1"
   },
   "devDependencies": {

src/components/structures/RoomDirectory.js

@@ -282,8 +282,7 @@ module.exports = React.createClass({
                 <SimpleRoomHeader title="Directory" />
                 <div className="mx_RoomDirectory_list">
                     <input ref="roomAlias" placeholder="Join a room (e.g. #foo:domain.com)" className="mx_RoomDirectory_input" size="64" onKeyUp={ this.onKeyUp }/>
-                    <GeminiScrollbar className="mx_RoomDirectory_tableWrapper"
-                                     relayoutOnUpdate={false} >
+                    <GeminiScrollbar className="mx_RoomDirectory_tableWrapper">
                         <table ref="directory_table" className="mx_RoomDirectory_table">
                             <tbody>
                                 { this.getRows(this.state.roomAlias) }