[kde-base/kactivities] Add minimal USE flag to permit coinstallation with kde-frameworks/kactivities.

Package-Manager: portage-2.2.10
[kde-frameworks/kactivities] Update blocker.

The only collision is /usr/bin/kactivitymanagerd, which is not installed
by kde-base/kactivities:4[minimal]. The binary provided by this package
is backwards-compatible with activities managed by the library provided
by the aforementioned package.

Package-Manager: portage-2.2.10