[Bug 36087] Change to higher priority without entering credentials

[Ben Pregont]

Public bug reported:
https://launchpad.net/malone/bugs/36087

Affects: gnome-system-monitor (Ubuntu)
       Severity: Normal
       Priority: (none set)
         Status: Unconfirmed

Description:
I am able to change priority of processes to a negative value without
entering password.

gnome-system-monitor 2.14.0 on dapper flight 5