[Pod] Fix SystemUI benchmark using SystemUIApplication.java

I5d5c6c38bfa1832b21e83af40f83659584149147 moved SystemUIApplication but
didn't update the benchmark.

Bug: 307607958
Flag: EXEMPT benchmark only
Test: `build/make/tools/perf/benchmarks` builds & runs
Change-Id: Ia6205619d10c9ecea046b93734a15a87bcb5f5a3