Fix unit test expect str

Author: qxy11

lldb/test/API/functionalities/statusline/TestStatusline.py

@@ -196,4 +196,4 @@ def _wait_for_server_ready_in_log(log_file_path, ready_message):
         self.launch(timeout=self.TIMEOUT)
         self.resize()
         self.expect("settings set show-statusline true", ["no target"])
-        self.expect(f"gdb-remote {connect_address}", substrs=["Process", "stopped"])
+        self.expect(f"gdb-remote {connect_address}", [b"a.out \xe2\x94\x82 signal SIGSTOP"])