fix(syncing): add space to bottom of sync page

[JimmyMow]

Fix for #666

[mrfelton]

@JimmyMow I actually fixed this already, in a slightly different way:

See #708

The problem really is that the actual display area is smaller on windows because you have the titlebar, and the menubar within the window itself, where as on mac this is not the case. The Electron useContentSize property addresses this specific issue.

[coveralls]

Pull Request Test Coverage Report for Build 3867

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.4%) to 14.996%

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Totals
Change from base Build 3859:	-0.4%
Covered Lines:	571
Relevant Lines:	3407

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💛 - Coveralls

[JimmyMow]

@mrfelton ok this can be closed. i was just scrolling through the open issues looking for things to fix. let's close #666 then?

[mrfelton]

Yes, I think so. I like this approach because it ensures that we have the exact same pixel height to work with on both platforms rather than leaving it up to guess work

[mrfelton]

... I mean to merge the fix from #708 and close this one