Add padding before first item in the flyout

[gonfunko]

We're missing a few pixels of padding that Scratch has:

[cwillisf]

I think this one is important for smaller fingers on a touchscreen or tablet

[plabanTest1]

Working as expected.

Smartphone:

Tablet:

[gonfunko]

We're back to missing one or two pixels, reopening

[yuri-kiss]

seems to be fixed again