Fixed out-of-order Rgb fields

lib/minifb/src/minifb.zig

@@ -7,9 +7,9 @@ const c = @cImport({
 const testing = std.testing;
 
 pub const Rgb = packed struct {
-    r: u8,
-    g: u8,
     b: u8,
+    g: u8,
+    r: u8,
     _reserved: u8 = 0,
 };