Fix insert button not updating:

When switching between collections with the same number of documents and
same sample size, the sample message would not update. This was only
noticable switching between a readonly view and a normal collection.

Author: durran

src/internal-packages/query/lib/component/sampling-message.jsx

@@ -34,20 +34,6 @@ class SamplingMessage extends React.Component {
     this.unsubscribeLoadMore = this.loadMoreDocumentsStore.listen(this.handleLoadMore.bind(this));
   }
 
-  /**
-   * Only update when the count changes.
-   *
-   * @param {Object} nextProps - The next properties.
-   * @param {Object} nextState - The next state.
-   *
-   * @returns {Boolean} If the component should update.
-   */
-  shouldComponentUpdate(nextProps, nextState) {
-    return (nextState.count !== this.state.count) ||
-      (nextState.loaded !== this.state.loaded) ||
-      (nextProps.sampleSize !== this.props.sampleSize);
-  }
-
   /**
    * Unsibscribe from the document list store when unmounting.
    */