fix lint

Author: mmalerba

src/demo-app/demo-app/demo-app.ts

@@ -1,5 +1,5 @@
 import {OverlayContainer} from '@angular/cdk/overlay';
-import {Component, ElementRef, Renderer2, ViewEncapsulation,} from '@angular/core';
+import {Component, ElementRef, Renderer2, ViewEncapsulation} from '@angular/core';
 
 /**
  * The entry app for demo site. Routes under `accessibility` will use AccessibilityDemo component,

src/demo-app/demo-app/demo-module.ts

@@ -1,4 +1,4 @@
-import {FullscreenOverlayContainer, OverlayContainer,} from '@angular/cdk/overlay';
+import {FullscreenOverlayContainer, OverlayContainer} from '@angular/cdk/overlay';
 import {CommonModule} from '@angular/common';
 import {NgModule} from '@angular/core';
 import {FormsModule, ReactiveFormsModule} from '@angular/forms';