Fix #9393: Consistent _buttonDown usage in ScreenSpaceEventHandler.js

[ayushd150]

Changes made to _buttonDown in ScreenSpaceEventHandler.js

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[ayushd150]

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[ayushd150]

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[ggetz]

Thanks @ayushd150!

First things first, could you let us know the reason for the change? It looks like this may be a fix for https://github.com/CesiumGS/cesium/issues/9393, is that correct?

If we do want to move forward with this PR–

• I can confirm we now have a CLA on file for you.
• Could you please pull your change from https://github.com/CesiumGS/cesium/pull/12614 into this branch so we can review everything together?

[jjspace]

I went ahead and pushed the changes from my comment above so we can try and get this merged. @lukemckinstry or @mzschwartz5 would you be able to take a quick look at this and merge if happy? You can check https://github.com/CesiumGS/cesium/issues/9393 for some context

[mzschwartz5]

I went ahead and pushed the changes from my comment above so we can try and get this merged. @lukemckinstry or @mzschwartz5 would you be able to take a quick look at this and merge if happy? You can check #9393 for some context

I'll take a look