Fix failing statsd unit tests

Statsd unit tests relied on temperature atom. Since this atom is now
pulled by SCS, it no longer works on unit tests. We should figure out
why SCS pullers fail in unit tests, but in the meantime this cl changes
the tests to use full battery capacity.

Test: tests now pass on blueline
Bug: 123530679
Change-Id: I17c5cd67c6bf64a4b572de0a88c7abe73e0fe87b