Update lvgl.rst - Prevent burn-in of LCD recipe fix

This removes an extraneous `lvgl.pause:` step under the `turn_off_action` which would result in:

1. lvgl is resumed
2. the screen is redrawn
3. lvgl is paused again (without `show_snow: true`, which is unnecessary)

Now the logic is fixed to where it is not paused again after redrawing.

1. lvgl is resumed
2. the screen is redrawn

I also took out the `delay: 1s` under both actions because they weren't explained as being necessary and elsewhere [where `lvgl.widget.redraw` is used][turn-off-screen-when-idle-recipe], there is no subsequent delay added. 


[turn-off-screen-when-idle-recipe]: https://esphome.io/cookbook/lvgl.html#turn-off-screen-when-idle

cookbook/lvgl.rst

@@ -2204,7 +2204,6 @@ In the example below, pixel training is done four times for a half an hour every
               then:
                 - lvgl.resume:
                 - lvgl.widget.redraw:
-                - delay: 1s
           - lvgl.pause:
               show_snow: true
         turn_off_action:
@@ -2214,8 +2213,6 @@ In the example below, pixel training is done four times for a half an hour every
               then:
                 - lvgl.resume:
                 - lvgl.widget.redraw:
-                - delay: 1s
-                - lvgl.pause:
 
     touchscreen:
       - platform: ...