Update sprite for HK and KR

[tommi-lew]

• Additional payment logos for HK and KR
• KR flag

This is a dependency for #94 which requires the KR flag on this new sprite.
Supersedes #87 .

[tommi-lew]

@yuralala8 As a FYI.
@tachyons For HK new payment types.
@zamakkat and @ycewe as they are likely to have most context on style guide.

[tommi-lew]

Dankew

@tachyons
Add sprite dimension to css

[tommi-lew]

Note to self: This is no longer relevant for HK as a seperate PR is merged. There will be conflicts with the sprite file and it has to be resolved manually.