Matrix user admin option

src/freedombone-app-matrix

@@ -444,7 +444,9 @@ function add_user_matrix {
     read_config_param MATRIX_DOMAIN_NAME
 
     if [[ "$new_username" == "$MY_USERNAME" ]]; then
-        add_user_matrix_admin='-a'
+        add_user_matrix_admin='--admin'
+    else
+        add_user_matrix_admin='--no-admin'
     fi
 
     "${PROJECT_NAME}-pass" -u "$new_username" -a matrix -p "$new_user_password"