apps: calc: Optimize the fields lookup structure

Currently the fields is a list of lists of strings. This will needlessly
consume RAM so lets switch it over to a simple string (which is immutable
and can be stored in flash).

We also replace indices with simple x and y variables. In addition to
avoiding a (temporary) memory allocation this is also easier to use
when looking up in fields.

Signed-off-by: Daniel Thompson <daniel@redfelineninja.org.uk>

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