selection persists after changing page

in case of `options.serverSide: true` selecting a row then changing page will select the corresponding row on the next page if number of rows changed from the first page to the second.

most likely due to this condition https://github.com/gregnb/mui-datatables/blob/ca67aaeb1602b4585e145b361151ce62a8b2d3dd/src/MUIDataTable.js#L333

## Steps to Reproduce (for bugs)

1. run https://github.com/gregnb/mui-datatables/blob/master/examples/serverside-pagination/index.js changing `rowsPerPage` to 15.
2. select the first row of the first page.
3. go to next page.
4. the first row of the second page is selected by default!

## Expected Behavior
selected rows should be reset after changing page.

## Current Behavior
in case number of rows changed from a page to another the data change won't be detected and the corresponding rows of the same page will be selected.

## Your Environment
running an example included in the repo in chrome.

| Tech | Version |
|--------------|---------|
| MUI-datatables | 3.4.1 & master |
| browser | chrome |