Revert "Sandbox soong_build by changing to root directory"

This reverts commit 05c25ccb4adb5329add700b533416c226cdbfa96.

Reason for revert: broke absolute OUT_DIR
Bug: 146437378

Change-Id: I523ed79d40e1c1ef040212ba794a7a084abea75d
diff --git a/java/dexpreopt_config.go b/java/dexpreopt_config.go
index f3191e7..35748b8 100644
--- a/java/dexpreopt_config.go
+++ b/java/dexpreopt_config.go
@@ -36,11 +36,10 @@
 
 func dexpreoptGlobalConfigRaw(ctx android.PathContext) globalConfigAndRaw {
 	return ctx.Config().Once(dexpreoptGlobalConfigKey, func() interface{} {
-		if data, err := ctx.Config().DexpreoptGlobalConfig(ctx); err != nil {
-			panic(err)
-		} else if data != nil {
+		if f := ctx.Config().DexpreoptGlobalConfig(); f != "" {
 			soongConfig := dexpreopt.CreateGlobalSoongConfig(ctx)
-			globalConfig, err := dexpreopt.LoadGlobalConfig(ctx, data, soongConfig)
+			ctx.AddNinjaFileDeps(f)
+			globalConfig, data, err := dexpreopt.LoadGlobalConfig(ctx, f, soongConfig)
 			if err != nil {
 				panic(err)
 			}