Always set targetSdkLevel to DefaultAppTargetSdk

Test: m
Bug: 156914912
Change-Id: Ibe63352c2fc474dd816d87ac79b31a56d32b35d2
diff --git a/apex/builder.go b/apex/builder.go
index 06c10eb..cebd86a 100644
--- a/apex/builder.go
+++ b/apex/builder.go
@@ -445,11 +445,11 @@
 		}
 
 		targetSdkVersion := ctx.Config().DefaultAppTargetSdk()
+		// TODO(b/157078772): propagate min_sdk_version to apexer.
 		minSdkVersion := ctx.Config().DefaultAppTargetSdk()
 
 		if a.minSdkVersion(ctx) == android.SdkVersion_Android10 {
 			minSdkVersion = strconv.Itoa(a.minSdkVersion(ctx))
-			targetSdkVersion = strconv.Itoa(a.minSdkVersion(ctx))
 		}
 
 		if java.UseApiFingerprint(ctx) {