drop f27 appdata/metainfo hack

no longer needed, using %%_metainfodir directly now

kf5.spec

@@ -51,13 +51,6 @@ sed -i \
   -e "s|@@KF5_VERSION@@|%{version}|g" \
   %{buildroot}%{_rpmconfigdir}/macros.d/macros.kf5
 
-# stick to legacy appdata dir for < f28, use metainfo for new releases only
-%if 0%{?fedora} && 0%{?fedora} < 28
-sed -i \
-  -e 's|^%%_kf5_metainfodir.*|%%_kf5_metainfodir %%_kf5_datadir/appdata|g' \
-  %{buildroot}%{_rpmconfigdir}/macros.d/macros.kf5
-%endif
-
 
 %files filesystem
 %{_sysconfdir}/xdg/plasma-workspace/