Fixed lint errors.

src/components/filter/FilterEditor.jsx

@@ -296,7 +296,7 @@ export default class CombiningFilterEditor extends React.Component {
           />
           {this.state.valueIsSimpleFilter &&
             <div className="maputnik-expr-infobox">
-              You've entered a old style filter,{' '}
+              You&apos;ve entered a old style filter,{' '}
               <button
                 onClick={this.makeFilter}
                 className="maputnik-expr-infobox__button"

src/styles/index.scss

@@ -74,7 +74,6 @@
   color: $color-white;
 }
 .maputnik-expr-infobox__button {
-  unset: all;
   background: none;
   border: none;
   padding: 0;