polkit: Allow remote upgrades

Fixes #1005

Author: clefebvre

usr/share/polkit-1/actions/com.linuxmint.mint-release-upgrade.policy

@@ -10,8 +10,8 @@
   <action id="com.linuxmint.mint-release-upgrade.upgrade">
     <icon_name>mintupdate</icon_name>
     <defaults>
-      <allow_any>no</allow_any>
-      <allow_inactive>no</allow_inactive>
+      <allow_any>auth_admin_keep</allow_any>
+      <allow_inactive>auth_admin_keep</allow_inactive>
       <allow_active>auth_admin_keep</allow_active>
     </defaults>
     <annotate key="org.freedesktop.policykit.exec.path">/usr/bin/mint-release-upgrade-root</annotate>