kmahjongg app icon: drop broken <use> entries href'ing to non-existing id
"facesize" is an id for a helper shape in the original MMahjongg tileset theme Jade, which seems to have slipped into the design of the app icon when the "DRAGON_3" tile face was used as material.
QtSvg fills the log with "qt.svg: link #facesize is undefined!" due to this, better avoided. Can be seen e.g. during kmahjongg startup when it creates the QIcon to set for the window (as also used in the KAboutDialog):
qt.svg: link #facesize is undefined!
qt.svg: link #facesize is undefined!
qt.svg: link #facesize is undefined!
qt.svg: link #facesize is undefined!
qt.svg: link #facesize is undefined!
qt.svg: link #facesize is undefined!
qt.svg: link #facesize is undefined!
qt.svg: link #facesize is undefined!
qt.svg: link #facesize is undefined!
qt.svg: link #facesize is undefined!
qt.svg: link #facesize is undefined!
qt.svg: link #facesize is undefined!
qt.svg: link #facesize is undefined!
qt.svg: link #facesize is undefined!
qt.svg: link #facesize is undefined!
qt.svg: link #facesize is undefined!
qt.svg: link #facesize is undefined!
qt.svg: link #facesize is undefined!
qt.svg: link #facesize is undefined!
qt.svg: link #facesize is undefined!
qt.svg: link #facesize is undefined!
qt.svg: link #facesize is undefined!
qt.svg: link #facesize is undefined!
qt.svg: link #facesize is undefined!
qt.svg: link #facesize is undefined!
qt.svg: link #facesize is undefined!
qt.svg: link #facesize is undefined!
qt.svg: link #facesize is undefined!