Slightly improve historical app opp dumping

Make it more similar to the rest of the app op dumping by using = as a
separator, using the same names for the uid state, and nicely
formatting durations.  Also added a missing separator and some extra
spaces.

Test: Dump the app ops.
Change-Id: Ib822ffb970460c45fc59f02a0a91e21ce668577a
1 file changed