Update favicon mediawiki.ico

Added 48x48 version.

Bug: 58122
Change-Id: Ia4a6f740b2d8d02e8f70fdb15042e3fe16678bea
Update favicon wikinews.ico

Added 48x48 version of the logo to the already existing 16x16 and 32x32 icons.

Bug: 58143
Change-Id: I145704bcc2ded89c2991f7eafa5c547de2836201