perf: decrease virtual scroll render throttling to 10ms

[ghiscoding]

• see SlickGrid comment for more info
• a lower thottling delay (10ms instead of previously 50ms) will show blank area for a much shorter period whenever we scroll to an uncached scroll position (for example completely scroll to bottom of large grid)
• NOTE: a throttling of 0ms causes flickering and/or other issues in some cases, but 5ms seems like a good number to use

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.8%. Comparing base (559d7de) to head (d76b738). Report is 6 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1648 +/- ## ======================================= Coverage 99.8% 99.8% ======================================= Files 199 199 Lines 21874 21874 Branches 7176 7037 -139 ======================================= Hits 21811 21811 - Misses 57 63 +6 + Partials 6 0 -6 ```

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