Revert "logd: logcat --clear respect pruneMargin"

This reverts commit fd20add62125178432ffacb50bf18b174b990c2d.

This is a partial revert of the above commit.  It simply removes
pruneMargin from these calculations since it is going away.

Bug: 149340579
Test: --clear works well
Change-Id: I1763be56fae7052058a800fad3b295c73cdcadf6
2 files changed
tree: 6b8f3205456a806ff6fc938f4a421f1d77b37737
  1. liblog/
  2. logcat/
  3. logd/
  4. logwrapper/