Add an ignore_power_sleepcover setting to ignore Kobo power_sleepcover keycode

frontend/device/kobo/device.lua

@@ -86,13 +86,16 @@ function Kobo:init()
     self.input = require("device/input"):new{
         device = self,
         event_map = {
-            [59] = "Power_SleepCover",
             [90] = "Light",
             [102] = "Home",
             [116] = "Power",
         }
     }
 
+    if not G_reader_settings:readSetting("ignore_power_sleepcover") then
+        self.input.event_map[59] = "Power_SleepCover"
+    end
+
     Generic.init(self)
 
     self.input.open("/dev/input/event0") -- Light button and sleep slider