CoverBrowser list mode: fix shortcut icon position

[hius07]

Before

Mirrored layout, the icon in the right

After

---

This change is 

[poire-z]

Trusting you on the maths - and on the big cleanup that looks ok.

[poire-z]

How did you witness that ? Are you finally using the emulator ? Or do you have a Kindle with keys ?

[hius07]

Set to true

koreader/frontend/ui/widget/menu.lua

Line 594 in fab3a43

is_enable_shortcut = Device:hasKeyboard(),

[hius07]

Trusting you on the maths

Not a big maths, FrameContainer adds bordersize:

koreader/frontend/ui/widget/container/framecontainer.lua

Lines 62 to 65 in fab3a43

	return Geom:new{
	w = content_size.w + ( self.margin + self.bordersize ) * 2 + self._padding_left + self._padding_right,
	h = content_size.h + ( self.margin + self.bordersize ) * 2 + self._padding_top + self._padding_bottom
	}

[Commodore64user]

the position on grid mode is also a bit weird. of course there is the variability of the book cover heights.