Only show apps button if labs feature enabled.

src/components/views/rooms/MessageComposer.js

@@ -315,6 +315,7 @@ export default class MessageComposer extends React.Component {
         }
 
         // Apps
+        if (UserSettingsStore.isFeatureEnabled('matrix_apps')) {
             if (this.props.showApps) {
                 hideAppsButton =
                     <div key="controls_hide_apps" className="mx_MessageComposer_apps" onClick={this.onHideAppsClick} title="Hide Apps">
@@ -326,6 +327,7 @@ export default class MessageComposer extends React.Component {
                         <TintableSvg src="img/icons-apps.svg" width="35" height="35"/>
                     </div>;
             }
+        }
 
         const canSendMessages = this.props.room.currentState.maySendMessage(
             MatrixClientPeg.get().credentials.userId);