Remove matrix from selectable apps

src/freedombone-app-matrix

 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-VARIANTS='full full-vim chat'
+VARIANTS=''
 
 IN_DEFAULT_INSTALL=0
 SHOW_ON_ABOUT=0