android: Fix leak of JNI local ref in IMC when creating string array

Fixes: 036fa7a166 ("android: Overload for getMeasurement() that takes a String array as argument")

src/frontends/android/app/src/main/jni/libandroidbridge/byod/imc_android.c

@@ -192,6 +192,7 @@ static jobjectArray string_array_create(JNIEnv *env, enumerator_t *enumerator)
 			goto failed;
 		}
 		(*env)->SetObjectArrayElement(env, jarray, i++, jstring);
+		(*env)->DeleteLocalRef(env, jstring);
 	}
 	enumerator->destroy(enumerator);
 	list->destroy(list);