test-data.mk: fix perf test data dependency

both the encode and decode perf tests require niklas_1280_720_30.yuv
broken since:
28eebf3 Merge "tests: add a shorter 720p test clip"
7839d03 tests: add a shorter 720p test clip

Change-Id: I51ebbf7261832e25d8f2c1da5c7df5c2e47f748e
1 file changed