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
diff --git a/cmds/installd/otapreopt.cpp b/cmds/installd/otapreopt.cpp
index 60ad14b..3909cb8 100644
--- a/cmds/installd/otapreopt.cpp
+++ b/cmds/installd/otapreopt.cpp
@@ -621,7 +621,7 @@
             }
         }
 
-        if (param_index != 12) {
+        if (param_index != 13) {
             LOG(ERROR) << "Not enough parameters";
             return false;
         }