FALSE NEGATIVE: NULLPTR_DEREFERENCE misses a static final null field

Hi, I found a false negative in Infer 1.3.0 when a static final field initialized to null is dereferenced.

**Affected checker**

`Infer NULLPTR_DEREFERENCE`

**Minimal reproducer**

```java
class InferNullStaticField {
static final Object VALUE = null;

void test() {
VALUE.toString();
}
}
```

**Reproduction command**

```bash
infer --version
infer run --pulse --enable-issue-type NULLPTR_DEREFERENCE -- javac infer-nullptr-fn-static-null-field.java
```

**Current behavior**

Infer completes successfully but produces no `NULLPTR_DEREFERENCE` finding.

**Expected behavior**

Infer should report `NULLPTR_DEREFERENCE` at line 5 because `VALUE` is initialized to null and dereferenced.