generalize `ge0_integral_closed_ball`

[affeldt-aist]

analysis/theories/lebesgue_integral.v

Line 6361 in 7171aaf

Lemma ge0_integral_closed_ball (r : R) (r0 : (0 < r)%R) (f : R -> \bar R) :

does not need to be restricted to 0-centered balls