Fix JVM unit tests: stub android.util.Log via returnDefaultValues.

AudioNegotiatorTest hit unmocked Log.i/w from negotiation logging and
NativeCodecBridge load failures on the desktop test runner.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/build.gradle

@@ -111,7 +111,10 @@ android {
     }
 
     testOptions {
-        unitTests.includeAndroidResources = true
+        unitTests {
+            includeAndroidResources = true
+            returnDefaultValues = true
+        }
     }
 }