JobsCommand: switch default, do not run forever

This reflects former behaviour, as this has already been documented
for cronjob usage

application/clicommands/JobsCommand.php

@@ -23,10 +23,10 @@ class JobsCommand extends Command
             return;
         }
 
-        if ($this->params->shift('once')) {
-            $this->runAllPendingJobs();
-        } else {
+        if ($this->params->shift('forever')) {
             $this->runforever();
+        } else {
+            $this->runAllPendingJobs();
         }
     }