Fix: Bring back styles on Switch components when checked

Fixed bug introduced by replacing native input with @grafana/ui/Input component.

Switch's styling relies on native input checked attribute used in adjacent sibling selector. Because React based Input is wrapped in div, there was no chance for styling to work

packages/grafana-ui/src/components/Switch/Switch.tsx

@@ -1,6 +1,5 @@
 import React, { PureComponent } from 'react';
 import uniqueId from 'lodash/uniqueId';
-import { Input } from '@grafana/ui';
 
 export interface Props {
   label: string;
@@ -39,7 +38,7 @@ export class Switch extends PureComponent<Props, State> {
         <label htmlFor={labelId} className={`gf-form gf-form-switch-container ${className || ''}`}>
           {label && <div className={labelClassName}>{label}</div>}
           <div className={switchClassName}>
-            <Input id={labelId} type="checkbox" checked={checked} onChange={this.internalOnChange} />
+            <input id={labelId} type="checkbox" checked={checked} onChange={this.internalOnChange} />
             <span className="gf-form-switch__slider" />
           </div>
         </label>