UIManager: Always send PowerOff & Reboot events

They were only sent when said action was triggered manually.

Note that this is perfectly harmless, since, currently,
nothing actually responds to those events ;).

frontend/device/generic/device.lua

@@ -1020,7 +1020,6 @@ function Device:_setEventHandlers(uimgr)
                 text = message_text or _("Are you sure you want to reboot the device?"),
                 ok_text = _("Reboot"),
                 ok_callback = function()
-                    UIManager:broadcastEvent(Event:new("Reboot"))
                     UIManager:nextTick(UIManager.reboot_action)
                 end,
             })
@@ -1036,7 +1035,6 @@ function Device:_setEventHandlers(uimgr)
                 text = message_text or _("Are you sure you want to power off the device?"),
                 ok_text = _("Power off"),
                 ok_callback = function()
-                    UIManager:broadcastEvent(Event:new("PowerOff"))
                     UIManager:nextTick(UIManager.poweroff_action)
                 end,
             })

frontend/ui/uimanager.lua

@@ -71,6 +71,7 @@ function UIManager:init()
     self.poweroff_action = function()
         self._entered_poweroff_stage = true
         logger.info("Powering off the device...")
+        self:broadcastEvent(Event:new("PowerOff"))
         self:broadcastEvent(Event:new("Close"))
         local Screensaver = require("ui/screensaver")
         Screensaver:setup("poweroff", _("Powered off"))
@@ -88,6 +89,7 @@ function UIManager:init()
     self.reboot_action = function()
         self._entered_poweroff_stage = true
         logger.info("Rebooting the device...")
+        self:broadcastEvent(Event:new("Reboot"))
         self:broadcastEvent(Event:new("Close"))
         local Screensaver = require("ui/screensaver")
         Screensaver:setup("reboot", _("Rebooting…"))