First StyleComponentList should remove from 'auto' style.

This happens when there are no `--style` arguments other than the one
passed in as a command line argument.

Prior to this change, removing a style component (e.g. `--style=-numbers`)
would remove the component from an empty style component set, resulting
in no styles at all. That behaviour was less intuitive than the new
behaviour, which starts out with the default components and
removes the line numbers.

src/bin/bat/app.rs

@@ -405,7 +405,7 @@ impl App {
                     .map(|v| StyleComponentList::from_str(v))
                     .collect::<Result<Vec<StyleComponentList>>>()?;
 
-                StyleComponentList::to_components(lists, self.interactive_output)
+                StyleComponentList::to_components(lists, self.interactive_output, true)
             }
 
             // Use the default.