fix(FeatureFlexibleContentExtension): add component tooltip positioning

[aaronmeder]

Resolves issue mentioned here for me: https://github.com/flyntwp/flynt/discussions/499 Works locally in Firefox and Chrome.

Previously the tooltip could be positioned out of view when there's a scrollbar:

This is most likely my first direct code commit to an open source project through Github btw...hope everything is fine in terms of the way how it's done 😉 Changing one character seems like a good start 😛

[timohubois]

@aaronmeder we merged your PR – many thanks for the fix!