Enable full object validation by default

Full object validation was always done before this hint and there are a number of shipping products that relied on this, so don't change it by default.

include/SDL3/SDL_hints.h

@@ -691,9 +691,8 @@ extern "C" {
  * The variable can be set to the following values:
  *
  * - "1": Enable fast parameter error checking, e.g. quick NULL checks, etc.
- *   (default)
  * - "2": Enable full parameter error checking, e.g. validating objects are
- *   the correct type, etc.
+ *   the correct type, etc. (default)
  *
  * This hint can be set anytime.
  *