misc: IO is probably ok written in caps

src/emulator/ui/interface.rs

@@ -12,7 +12,7 @@ pub trait Component {
 pub enum Category {
     Control,
     Memory,
-    Io,
+    IO,
     Programming,
 }
 
@@ -22,14 +22,14 @@ impl Category {
         match self {
             Self::Control => "Control Systems",
             Self::Memory => "Memory Systems",
-            Self::Io => "I/O Systems",
+            Self::IO => "I/O Systems",
             Self::Programming => "Programming",
         }
     }
 
     #[must_use]
     pub fn list() -> Vec<Self> {
-        vec![Self::Control, Self::Memory, Self::Io, Self::Programming]
+        vec![Self::Control, Self::Memory, Self::IO, Self::Programming]
     }
 }