fix: update If! for the latest compiler version

This commit addresses the following error:

    error: expressions must be enclosed in braces to be used as const generic arguments
     --> src/r3/src/utils/int.rs:9:9
      |
    9 |     if (MAX <= u8::MAX as u128) {
      |         ^^^

Author: yvt

src/r3/src/utils.rs

@@ -7,7 +7,7 @@ use core::marker::PhantomData;
 /// Conditional type
 macro_rules! If {
     ( if ($cond:expr) { $t:ty } else { $f:ty } ) => {
-        <crate::utils::Conditional<$t, $f, $cond> as crate::utils::TypeFn>::Output
+        <crate::utils::Conditional<$t, $f, {$cond}> as crate::utils::TypeFn>::Output
     };
     ( if ($cond:expr) { $t:ty } else if $($rest:tt)* ) => {
         If! { if ($cond) { $t } else { If!{ if $($rest)* } } }

src/r3_portkit/src/utils.rs

@@ -10,7 +10,7 @@ pub use r3::utils::Init;
 /// Conditional type
 macro_rules! If {
     ( if ($cond:expr) { $t:ty } else { $f:ty } ) => {
-        <crate::utils::Conditional<$t, $f, $cond> as crate::utils::TypeFn>::Output
+        <crate::utils::Conditional<$t, $f, {$cond}> as crate::utils::TypeFn>::Output
     };
     ( if ($cond:expr) { $t:ty } else if $($rest:tt)* ) => {
         If! { if ($cond) { $t } else { If!{ if $($rest)* } } }