fixup WSOD on install properly this time

fulcrm_apiv2.install

@@ -9,8 +9,8 @@ function fulcrm_apiv2_install() {
     } catch ( Exception $e ) {
         $url = array();
     }
-    
+
     $url[] = fulcrm_uuid_uuid4();
     $url = implode( '.', $url );
-    set_variable( 'fulcrm_apiv2_client_id', $url );
+    variable_set( 'fulcrm_apiv2_client_id', $url );
 }