[lldb] Update error messages in TestMemoryHistory.py

Update TestMemoryHistory.py for daba823622
which changes the CommandObject & Disassemble error messages .

lldb/test/API/functionalities/asan/TestMemoryHistory.py

@@ -40,7 +40,7 @@ class AsanTestCase(TestBase):
         # "memory history" command should not work without a process
         self.expect("memory history 0",
                     error=True,
-                    substrs=["invalid process"])
+                    substrs=["Command requires a current process"])
 
         self.runCmd("run")