Fix wrong JNI call function when calling QAndroidIntent::putExtra()

The Java function putExtra() returns an object, so it should be called
with callObjectMethod() instead of callMethod().

Fixes: QTBUG-77101
Change-Id: Id6bb402c05b119257fb331db1eb4e016a94c0d52
Reviewed-by: BogDan Vatra <bogdan@kdab.com>