Remove SDL3/TTF flag NORMAL

It's a `bit_set`, and NORMAL is an empty one.

https://wiki.libsdl.org/SDL3_ttf/TTF_SetFontStyle

Fixes #5275

vendor/sdl3/ttf/sdl3_ttf.odin

@@ -51,7 +51,6 @@ Text :: struct {
 }
 
 FontStyle :: enum u32 {
-	NORMAL,
 	BOLD,
 	ITALIC,
 	UNDERLINE,