logd: Turn off default prune by worst UID

- Algorithm places too much weight on stack dumps

Change-Id: Ibb31a59892870397b780965ec791f47a4ce87eaf
diff --git a/logd/LogWhiteBlackList.cpp b/logd/LogWhiteBlackList.cpp
index 5f8173f..2c10861 100644
--- a/logd/LogWhiteBlackList.cpp
+++ b/logd/LogWhiteBlackList.cpp
@@ -49,7 +49,7 @@
 }
 
 PruneList::PruneList()
-        : mWorstUidEnabled(true) {
+        : mWorstUidEnabled(false) {
     mNaughty.clear();
     mNice.clear();
 }