tests/float/math_constants.py: Test actual e and pi constant values.HEADmaster

The existing test for `math.e` and `math.pi` constants can fail on certain
targets if the functions `math.exp()` and/or `math.cos()` are not accurate
enough (eg out by an LSB of float precision).  For example this test
currently fails on PYBD_SF6 which uses double precision floats (and that's
due to the `lib/libm_dbl/exp.c` implementation not being exact).

This commit changes this constant test so that it tests the actual constant
value, not the evaluation of `exp()` and `cos()` functions.

Signed-off-by: Damien George <damien@micropython.org>

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