ReaderActivityIndicator: Oh god, my eyes, they buuuuurn.

Make this a real boy, with a transient lipc handle.
And get rid of the insane 1s sleep on affected ReaderView paints,
because ouchy.

This is completely deprecated anyway, so this is entirely pointless,
and mainly to prevent implementation details from creeping into
reader.lua.

reader.lua

@@ -334,9 +334,6 @@ local function exitReader()
         end
     end
 
-    local ReaderActivityIndicator =
-        require("apps/reader/modules/readeractivityindicator")
-
     -- Save any device settings before closing G_reader_settings
     Device:saveSettings()
 
@@ -344,9 +341,6 @@ local function exitReader()
     G_reader_settings:saveSetting("closed_rotation_mode", Device.orig_rotation_mode or Device.screen:getRotationMode())
     G_reader_settings:close()
 
-    -- Close lipc handles
-    ReaderActivityIndicator:coda()
-
     -- Restore initial inversion state
     Device.screen:setHWNightmode(hw_nightmode)