android: disable wakelocks by default

frontend/device/android/device.lua

@@ -68,9 +68,9 @@ function Device:init()
         self.isTouchDevice = yes
     end
 
-    -- check if we disabled support for wakelocks
-    if G_reader_settings:isTrue("disable_android_wakelock") then
-        android.setWakeLock(false)
+    -- check if we enabled support for wakelocks
+    if G_reader_settings:isTrue("enable_android_wakelock") then
+        android.setWakeLock(true)
     end
 
     Generic.init(self)

frontend/ui/elements/common_settings_menu_table.lua

@@ -133,7 +133,7 @@ if Device:isAndroid() then
     table.insert(common_settings.screen.sub_item_table,
         {
             text = _("Keep screen on"),
-            checked_func = function() return not G_reader_settings:isTrue("disable_android_wakelock") end,
+            checked_func = function() return G_reader_settings:isTrue("enable_android_wakelock") end,
             callback = function() require("ui/elements/screen_android"):toggleWakelock() end,
         })
 

frontend/ui/elements/screen_android.lua

@@ -44,9 +44,9 @@ end
 
 -- toggle android wakelock support
 function ScreenHelper:toggleWakelock()
-    local is_wakelock = not G_reader_settings:isTrue("disable_android_wakelock")
+    local is_wakelock = G_reader_settings:isTrue("enable_android_wakelock")
     android.setWakeLock(not is_wakelock)
-    G_reader_settings:saveSetting("disable_android_wakelock", is_wakelock)
+    G_reader_settings:saveSetting("enable_android_wakelock", not is_wakelock)
 end
 
 return ScreenHelper