atrace.rc: Correct path to saved_cmdlines_size when setting permission

Bug: 62375794
Test: CTS test

Change-Id: Ie252be152ba26aced63af55734d3155ad93f2919
Signed-off-by: Joel Fernandes <joelaf@google.com>
(cherry picked from commit 0094a2d5962ed81c6c624c900450d84f1967ba49)
1 file changed