Avoid targeting Java 9 for targets with SDK version up to 29.

Targets with sdk_version values up to and including 29 should not use
Java language level 9, even if EXPERIMENTAL_JAVA_LANGUAGE_LEVEL_9=true
is set.

This change fixes a downstream issue.

Bug: 131678633
Test: EXPERIMENTAL_JAVA_LANGUAGE_LEVEL_9=true make droid tests docs cts java
Test: (same test in downstream branch)
Change-Id: Ic58e8df2e06d6e07bc42255314521831dc41b239
diff --git a/java/java.go b/java/java.go
index e764ec3..db43c43 100644
--- a/java/java.go
+++ b/java/java.go
@@ -854,7 +854,7 @@
 		ret = javaVersion
 	} else if ctx.Device() && sdk <= 23 {
 		ret = "1.7"
-	} else if ctx.Device() && sdk <= 28 || !ctx.Config().TargetOpenJDK9() {
+	} else if ctx.Device() && sdk <= 29 || !ctx.Config().TargetOpenJDK9() {
 		ret = "1.8"
 	} else if ctx.Device() && sdkContext.sdkVersion() != "" && sdk == android.FutureApiLevel {
 		// TODO(ccross): once we generate stubs we should be able to use 1.9 for sdk_version: "current"