Only create certificate once

src/freedombone-app-matrix

                 rm /etc/ssl/certs/${MATRIX_DOMAIN_NAME}.dhparam
             fi
             echo $'Obtaining certificate for the main domain'
+            function_check create_site_certificate
             create_site_certificate ${MATRIX_DOMAIN_NAME} 'yes'
+
+            if [[ $ONION_ONLY == "no" ]]; then
+                chmod 755 /etc/ssl/certs/${MATRIX_DOMAIN_NAME}.dhparam
+            fi
         fi
     fi
 
     function_check matrix_nginx
     matrix_nginx
 
-    function_check create_site_certificate
-    create_site_certificate $MATRIX_DOMAIN_NAME 'yes'
-
-    if [[ $ONION_ONLY == "no" ]]; then
-        chmod 755 /etc/ssl/certs/${MATRIX_DOMAIN_NAME}.dhparam
-    fi
-
     function_check install_home_server
     install_home_server