fix: close() fn and options.onClose() should only be called w/open drop

[ghiscoding]

when instantiating ms-select with option { isOpen: true }, we delay the opening of the drop by a CPU cycle. However the issue is that the initContainer() has a click event listener on the document.body and when { isOpen: true } is provided, it triggers the click event (not really sure why but it doesn't really matter) and the bug is that we should allow the close() and options.onClose() to be called only if the drop is really open (and it's not opened until the CPU cycle delay, so we need another internal _isOpen variable to reference and with that in place the close isn't being called anymore when we first open originally open the drop)

This fixes an issue identified in Slickgrid-Universal were it was calling the options.onClose() when creating and opening the drop... so with the fix in place, it no longer calls the onClose() on the original drop opening.

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Playwright E2E Test Results

83 tests  ±0   83 ✅ ±0   1m 44s ⏱️ -4s
73 suites ±0    0 💤 ±0 
 1 files   ±0    0 ❌ ±0 

Results for commit 6167ac9. ± Comparison against base commit 25091b4.