Set a dedicated variable for the runtime apex libs.

Bug: 124789867
Test: build with coverage, the boot classpath has jacoco.jar in /system/framework, not the apex
Change-Id: Iaa0762b5a674282be95710d0e1fb166a58ec893b
diff --git a/dexpreopt/dexpreopt_test.go b/dexpreopt/dexpreopt_test.go
index a2c6f77..949f91f 100644
--- a/dexpreopt/dexpreopt_test.go
+++ b/dexpreopt/dexpreopt_test.go
@@ -29,7 +29,7 @@
 	PatternsOnSystemOther:              nil,
 	DisableGenerateProfile:             false,
 	BootJars:                           nil,
-	TargetCoreJars:                     nil,
+	RuntimeApexJars:                    nil,
 	ProductUpdatableBootModules:        nil,
 	ProductUpdatableBootLocations:      nil,
 	SystemServerJars:                   nil,