[TIMOB-24652] Android: Forces recompiling due to "navbar-hidden" change

When running recurring Android builds, I noticed this log:

[INFO]  Forcing rebuild: tiapp.xml navbar-hidden changed since last build
[INFO]    Was: false
[INFO]    Now: undefined

The flag was not changed (is false in tiapp.xml). Just create a new app, run it twice and watch the logs.