perfetto-ui: Fix ProcessScheduling track for upid = 0
perfetto-ui: Fix ProcessScheduling track for upid = 0

Bug: b/142254614
Change-Id: I8453bb23f2857f0d67378d10b78db9a0f86d03bf
google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto