CTS: increase runtime of CtsDeviceJankOpenGl subtests

Prolonging the run time of the tests ensures that the test's window is still
in existence when the frame stats for it that will get collected via dumpsys

Change-Id: I3931f1b8962b13fbe69680ca3f1c358c57c8c50a
(cherry picked from commit 8e7829fd1b9b11a2848d7e0998c0bdec924d6463)
1 file changed