message: Fix custom widget form styling
diff: @@ -74,7 +74,7 @@ export default React.createClass({
  <div className="mx_Dialog_content">
  {appCards}
  <hr/>
  - <form onSubmit={this.onFormSubmit}>
  + <form className="mx_Custom_Widget_Form" onSubmit={this.onFormSubmit}>
  <div>Or enter the URL of the widget to add.</div>
  <input type="text" ref="input_value" value={this.state.value}
  autoFocus={true} onChange={this.onValueChange} size="30"
  