ui: {guest, node} summary: use correct unit for CPU usage

One could also think about showing something like '% of N CPUs', but
this can be inaccurate for older data, because the number of CPUs can
change.

Reported in the community forum:
https://forum.proxmox.com/threads/117362/

Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>

www/manager6/node/Summary.js

@@ -162,6 +162,7 @@ Ext.define('PVE.node.Summary', {
 			    title: gettext('CPU usage'),
 			    fields: ['cpu', 'iowait'],
 			    fieldTitles: [gettext('CPU usage'), gettext('IO delay')],
+			    unit: 'percent',
 			    store: rrdstore,
 			},
 			{

www/manager6/panel/GuestSummary.js

@@ -75,6 +75,7 @@ Ext.define('PVE.guest.Summary', {
 		    pveSelNode: me.pveSelNode,
 		    fields: ['cpu'],
 		    fieldTitles: [gettext('CPU usage')],
+		    unit: 'percent',
 		    store: rrdstore,
 		},
 		{