[indicators] flight mode use of x and check mark is counterintuitive

[Steve Langasek]

Every time I look at the flight mode status on my phone, it takes me an extra second to understand the current state. Flight mode is "on", and shows a green check box, when the network is disabled; and flight mode is "off", showing a black and white X, when the network is enabled. This mental negation costs cognitive effort to decipher, because it's using the same symbols as the individual services (wifi, gps, bluetooth...) with an opposite meaning.

I'm not a designer, but my suggestion would be to use different symbols for on/off than are used elsewhere in the UI. (The other possibility would be to change the name of the setting to give it an opposite sense; I don't suggest doing this because "Flight mode" is a well-known name for the functionality.)

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Desired resolution: We have a new SDK toggle component which will address this issue. However the style is different from the Indicator UI so this will be actioned once we start on the overall design project since it can't be fixed as a single bug. There is no Epic Project Card as far as I am aware.