Clean up JSS dumping code.

Make JobSchedulerSerice dumping code utilize the increase/decreaseDedent
methods of IndentingPrintWriter.

Also reduce the amount we dump when an app filter is set.

Further cleanup (of other files) will be done in separate CLs.

Bug: 141645789
Bug: 176241740
Test: visually inspect dumpsys
Change-Id: I6b3935bb300ddf4f41197674378ce7d81f855312