Re-enable the daemon until Plasma 6
The plan was to use the new kglobalacceld, but that is not hooked
up to start on Plasma 5.
We can keep building this daemon as it doesn't actually conflict
with kf6-kglobalaccel or kglobalacceld.
After we ship Plasma 6 we should enable the compatibility flag again
and switch to using kglobalacceld instead. At that point we can use
-DBUILD_RUNTIME=OFF instead of -DKF6_COMPAT_BUILD=ON.