Fix Breadcrumbs2 ending up with 2 tabIndexes on Firefox due to explicit css overflow scroll

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

src/components/structures/IndicatorScrollbar.js

@@ -192,7 +192,7 @@ export default class IndicatorScrollbar extends React.Component {
             ref={this._collectScrollerComponent}
             wrappedRef={this._collectScroller}
             onWheel={this.onMouseWheel}
-            {... this.props}
+            {...this.props}
         >
             { leftOverflowIndicator }
             { this.props.children }