fix: do not round offset anymore

This change is to stop rounding the offset, in order to remove any large step changes at the boundaries whenever we're zoomed out (e.g. 1.0 suddenly changing to 2.0).

Please see the before and after results in the attached images. The before is from my machine. The after is from the storybook on github.

![pre_change_ongithubwebsite](https://user-images.githubusercontent.com/1366642/125308865-4493b200-e2ff-11eb-86e6-4f78e2fd1633.png)

![post_change_onmymachine](https://user-images.githubusercontent.com/1366642/125308855-43628500-e2ff-11eb-9910-f85cae3f3123.png)

packages/series/src/CandlestickSeries.tsx

@@ -132,8 +132,7 @@ export class CandlestickSeries extends React.Component<CandlestickSeriesProps> {
             plotData,
         });
 
-        const trueOffset = 0.5 * width;
-        const offset = trueOffset > 0.7 ? Math.round(trueOffset) : Math.floor(trueOffset);
+        const offset = 0.5 * width;
 
         return plotData
             .filter((d) => d.close !== undefined)