Added fallback to global timeline instead of throwing a error if
navigation type is unexpected.
Bug: b/195738728
Test: Open x20 file winscope-staging-priyankaspatel and select Flicker
mode from navigation options, then open local Winscope and check that
the global timeline still appears after running/uploading a trace.
Change-Id: I9ea336c31fa1f5c752eb4a30f55f08a3ee595811