kauth: switch back to FAKE backend (polkit-qt6 offline fetch blocked)

local/recipes/kde/kf6-kauth/recipe.toml

@@ -9,7 +9,6 @@ dependencies = [
     "qtbase",
     "kf6-extra-cmake-modules",
     "kf6-kcoreaddons",
-    "polkit-qt6",
 ]
 script = """
 DYNAMIC_INIT
@@ -33,8 +32,8 @@ cmake "${COOKBOOK_SOURCE}" \
     -DCMAKE_PREFIX_PATH="${COOKBOOK_SYSROOT}" \
     -DBUILD_TESTING=OFF \
     -DBUILD_QCH=OFF \
-    -DKAUTH_BACKEND_NAME=POLKITQT6-1 \
-    -DKAUTH_HELPER_BACKEND_NAME=POLKITQT6-1 \
+    -DKAUTH_BACKEND_NAME=FAKE \
+    -DKAUTH_HELPER_BACKEND_NAME=FAKE \
     -Wno-dev
 
 cmake --build . -j${COOKBOOK_MAKE_JOBS}