Use the documented syntax for default props in CreateReactClass

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

src/components/views/rooms/AuxPanel.js

@@ -57,10 +57,10 @@ module.exports = React.createClass({
         fullHeight: PropTypes.bool,
     },
 
-    defaultProps: {
+    getDefaultProps: () => ({
         showApps: true,
         hideAppsDrawer: false,
-    },
+    }),
 
     getInitialState: function() {
         return { counters: this._computeCounters() };