Invalid boolean values should fall back to the default

Previously, an invalid value was always false

src/option_parser.c

@@ -175,7 +175,7 @@ int ini_get_bool(char *section, char *key, int def)
                 case '0':
                         return false;
                 default:
-                        return false;
+                        return def;
                 }
         }
 }

test/option_parser.c

@@ -33,6 +33,7 @@ TEST test_ini_get_bool(void)
         ASSERT(ini_get_bool(bool_section, "boolbin1", false));
         ASSERT_FALSE(ini_get_bool(bool_section, "boolbin0", true));
 
+        ASSERT(ini_get_bool(bool_section, "boolinvalid", true));
         ASSERT_FALSE(ini_get_bool(bool_section, "boolinvalid", false));
 
         ASSERT(ini_get_bool(bool_section, "nonexistent", true));