Update favicon incubator.ico

Added 48x48 version.

Bug: 58144
Change-Id: I2512a130833babc2abd14524ddec0cd1d1367074
Update favicon wikisource.ico

Added 48x48 version.

Bug: 58147
Change-Id: I43048a01c7ef0ba47463707bf098cf26fa2b4a83