Fix number of arguments in otapreopt v4

V4 of otapreopt arguments adds a new argument, but previous CL
I5de64e96043404df39f09d3d16b575ee39951fcb did not increase that
value.

Bug: 64382372
Test: go/manual-ab-ota
Change-Id: I8139a0608f377a516d803e28d3b47a97b3b84f94
1 file changed