power: fg-alg: Fix condition to schedule TTF work

In the TTF algorithm, end ttf_work only during charging when SOC is
100% or charge is terminated.

ttf_work needs to be scheduled during discharging so that TTE
calculation can use ibatt_avg calculated from ibatt samples collected
every 10 seconds.

Fixes: 6a4db4ee ("power: fg-alg: Fix condition to schedule TTF work").

Change-Id: I59c3088706d014cd0d3d961cf302b0cf274ce2d6
Signed-off-by: Shyam Kumar Thella <sthella@codeaurora.org>