Codechange: Always pass raw strings to TextFilter's AddLine(). (#13666)

Remove StringID overload, so callers have to preformat the string.

src/stringfilter.cpp

@@ -123,29 +123,3 @@ void StringFilter::AddLine(const char *str)
 		}
 	}
 }
-
-/**
- * Pass another text line from the current item to the filter.
- *
- * You can call this multiple times for a single item, if the filter shall apply to multiple things.
- * Before processing the next item you have to call ResetState().
- *
- * @param str Another line from the item.
- */
-void StringFilter::AddLine(const std::string &str)
-{
-	AddLine(str.c_str());
-}
-
-/**
- * Pass another text line from the current item to the filter.
- *
- * You can call this multiple times for a single item, if the filter shall apply to multiple things.
- * Before processing the next item you have to call ResetState().
- *
- * @param str Another line from the item.
- */
-void StringFilter::AddLine(StringID str)
-{
-	AddLine(GetString(str));
-}