Remove overly specificy test expectation

Author: vogelsgesang

lldb/test/API/tools/lldb-dap/memory/TestDAP_memory.py

@@ -108,4 +108,3 @@ def test_readMemory(self):
         # Reads at offset 0x0 fail
         mem = self.dap_server.request_readMemory("0x0", 0, 6)
         self.assertEqual(mem["success"], False)
-        self.assertEqual(mem["message"], "memory read failed for 0x0")