Fix Render discard issue [pd-3ds]

- Clip Rects do now not discard when they move out of screen (cause the maths ends in < 0 which is not working with u32)
- Fixing ui7 crash wehn im input was nullptr

include/pd/core/strings.hpp

@@ -153,7 +153,7 @@ class U8Iterator {
   }
 
   bool PeekNext32(u32& ret) {
-    if (ptr + 1 == nullptr || *ptr + 1 == 0) return false;
+    // if ((ptr + 1) == 0 || *(ptr + 1) == 0) return false;
     u8 c = *ptr;
     if (c < 0x80) {
       ret = c;