ui: add mising panel help buttons

add missing help buttons (question mark, top right) so that we are
consistent and each panel has it.

I chose the IMHO most fitting sections.

Signed-off-by: Aaron Lauterer <a.lauterer@proxmox.com>

www/ServerAdministration.js

@@ -7,6 +7,8 @@ Ext.define('PBS.ServerAdministration', {
     border: true,
     defaults: { border: false },
 
+    tools: [PBS.Utils.get_help_tool("sysadmin-host-administration")],
+
     controller: {
 	xclass: 'Ext.app.ViewController',
 

www/Subscription.js

@@ -24,6 +24,7 @@ Ext.define('PBS.Subscription', {
     border: true,
 
     onlineHelp: 'get_help',
+    tools: [PBS.Utils.get_help_tool("get_help")],
 
     viewConfig: {
 	enableTextSelection: true,

www/SystemConfiguration.js

@@ -6,6 +6,7 @@ Ext.define('PBS.SystemConfiguration', {
     border: true,
     scrollable: true,
     defaults: { border: false },
+    tools: [PBS.Utils.get_help_tool("sysadmin-network-configuration")],
     items: [
 	{
 	    title: gettext('Network/Time'),