Increase contrast for text entry selection color on dark theme

Nelson Ben requested to merge dark_theme_increase_selection_color into main

Selection color in dark theme shows little contrast with the background, it uses same code as light theme i.e. transparentize($selected_bg_color, 0.7) so to increase the contrast we change it in dark theme to be transparentize($selected_bg_color, 0.2)

Part of #5725 (closed)


Captura_desde_2023-04-16_16-02-32 Captura_desde_2023-04-16_16-01-41


Captura_desde_2023-04-16_16-04-34 Captura_desde_2023-04-16_16-03-55

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