Fix installation location of kfontviewpart.rc
It looks like commit 8b297dbb (spotted by Albert Astals Cid), broke this, the KAboutData object used KFI_NAME (which is "kfontinst"), which made KxmlGui pick kfontviewpart.rc from ${KDE_INSTALL_KXMLGUI5DIR}/kfontinst.
Change the location to ${KDE_INSTALL_KXMLGUI5DIR}/kfontview, which is where kfontviewui.rc is installed already.