C2 VTS: Fix typo in picking up EOS param

signalEOS flag was wrongly read as third parameter instead of
second parameter in the video encoder tests

Bug: 300530283
Test: atest VtsHalMediaC2V1_0TargetVideoEncTest

Change-Id: I47f74259119c80d137b844e4f698eb040b4f780a
1 file changed