[Bug] if method browsers and supported browsers are not includes default browser, will add default browser automatically

[ansonliao]

For example:

public class Test_Demo {
    
    @Test
    @Firefox
    public void f1() {
        ...
    }
}

Default browser: @Chrome

Expects:
Test will run by browsers: @Firefox only.

Actually:
Test will run by browsers: @Chrome, @Firefox.