Drop unused dependencies (kf6-kwayland isn't packaged, anyway)

--- CMakeLists.txt.orig	2024-02-27 13:20:11 UTC
+++ CMakeLists.txt
@@ -35,19 +35,6 @@ find_package(Qt6 ${QT_MIN_VERSION} CONFIG REQUIRED
     Test
 )
 
-find_package(KF6 ${KF6_MIN_VERSION} COMPONENTS
-  CoreAddons
-  Wayland
-)
-set_package_properties(KF6CoreAddons PROPERTIES
-  TYPE REQUIRED
-  PURPOSE "For loading Wayland backend plugins"
-)
-set_package_properties(KF6Wayland PROPERTIES
-  TYPE OPTIONAL
-  PURPOSE "Required for KWin/KWayland backend"
-)
-
 find_package(Wrapland ${PROJECT_VERSION} CONFIG)
 set_package_properties(Wrapland PROPERTIES
   TYPE OPTIONAL