Implementing new visd for backlight indicator

With new design first tile with backlight icon has different shape than rest of the tiles. Also it changes color when backlight it turned off (level set to 0).
Besides there are a few small changes with paddings/corners.

Flag: KEYBOARD_BACKLIGHT_INDICATOR
Test: KeyboardBacklightDialogScreenshotTest
Fixes: 270374251
Change-Id: I8bfbafc2e637a5df6e8df536784187146ddc10ca