Fix LogAnalysis App Versions dump.

(cherry-picked from unsubmitted change in oc-dev ag/2549006 and updated)

Test: DumpsysPackageStatsItemTest, manual: java -classpath out/host/linux-x86/tradefed/loganalysis.jar com.android.loganalysis.LogAnalyzer --bugreport bugreport.txt
Bug: b/38415015
Change-Id: I6bce38a18441712d2f182a0d3c60b7851f87470e