fix(funnels): fix infinite scroll for wide funnels

[thmsobrmlr]

Problem

See https://posthog.slack.com/archives/C0368RPHLQH/p1700215685287799. An additional scrollbar causes the size calculation to loop.

Changes

I'm working on a proper fix, but this should fix the problem temporarily (only doesn't look good). Here we're simply subtracting the height of the scrollbar that gets added when the content gets to wide from the height of the bars. 17px is the size of scrollbars on windows apparently.

How did you test this code?

Testing with funnels in different configurations

[benjackwhite]

Yeah thats pretty nasty 😬 but makes sense to just fix this issue (just the debug log to remove)

[posthog-bot]

📸 UI snapshots have been updated

15 snapshot changes in total. 0 added, 15 modified, 0 deleted:

• chromium: 0 added, 11 modified, 0 deleted (diff for shard 1, diff for shard 2)
• webkit: 0 added, 4 modified, 0 deleted (diff for shard 2)

Triggered by this commit.

👉 Review this PR's diff of snapshots.

[github-actions]

Size Change: +304 B (0%)

Total Size: 1.97 MB

Filename	Size	Change
frontend/dist/toolbar.js	1.97 MB	+304 B (0%)

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