[Test] quick fix mla ut (#4318)

### What this PR does / why we need it?

### Does this PR introduce _any_ user-facing change?

### How was this patch tested?

- vLLM version: v0.11.0
- vLLM main:
vllm-project/vllm@2918c1b

Signed-off-by: GDzhu01 <809721801@qq.com>

Author: GDzhu01

tests/ut/models/test_mla.py

@@ -211,5 +211,3 @@ def test_forward(self, mock_get_forward_context, mock_tp_size,
         output = attn.forward(positions, hidden_states)
 
         self.assertEqual(output.shape, (3, self.hidden_size))
-        self.assertTrue(
-            torch.allclose(output, output.view(-1, self.hidden_size)))