app_featureprocess: Remove unnecessary bug fixes.

Remove BUGGY_AST_SUB handling since this bug has been fixed.

Author: InterLinked1

apps/app_featureprocess.c

@@ -335,19 +335,10 @@ static void assign_vars(struct ast_channel *chan, struct ast_str *strbuf, char *
 static int check_condition(struct ast_channel *chan, struct ast_str *strbuf, char *condition)
 {
 	int res;
-#define BUGGY_AST_SUB 1
 
-#if BUGGY_AST_SUB
-	char substituted[1024];
-#endif
-
-#if BUGGY_AST_SUB
-	pbx_substitute_variables_helper(chan, condition, substituted, sizeof(substituted) - 1);
-	ast_str_set(&strbuf, 0, "%s", substituted);
-#else
 	ast_str_reset(strbuf);
 	ast_str_substitute_variables(&strbuf, 0, chan, condition);
-#endif
+
 	ast_debug(2, "Condition to check: %s (evaluates to %s)\n", condition, ast_str_buffer(strbuf));
 	res = pbx_checkcondition(ast_str_buffer(strbuf));
 	ast_str_reset(strbuf);