Solitaire: Say what value was passed as wrong instruction id

Change-Id: I4b79ba95ab5a43a197dfdd164b731d37b490a093

solana/solitaire/program/src/error.rs

@@ -46,7 +46,7 @@ pub enum SolitaireError {
     AlreadyInitialized(Pubkey),
 
     /// An instruction that wasn't recognised was sent.
-    UnknownInstruction,
+    UnknownInstruction(u8),
 
     Custom(u64),
 }

solana/solitaire/program/src/macros.rs

@@ -80,8 +80,8 @@ macro_rules! solitaire {
                         },
                     )*
 
-                    _ => {
-                        Err(SolitaireError::UnknownInstruction)
+                    other => {
+                        Err(SolitaireError::UnknownInstruction(other))
                     }
                 }
             }