Fix typo in vts_treble_sys_prop_test

Bug: 177250967
Test: atest vts_treble_sys_prop_test
Change-Id: I5d5fb465cd6f472e78380c468a4b8c0dd563de90
(cherry picked from commit 7a728bbd9055a3442ef7ac83bd2798e3cfc1b602)
1 file changed