[Sol->Yul] Changing yul unimplemented test as delete bytes is implemented now.

test/cmdlineTests/yul_unimplemented/err

@@ -1,5 +1,5 @@
-Error (1834): Unimplemented feature error: Byte Arrays not yet implemented! in FILENAME REMOVED
- --> yul_unimplemented/input.sol:6:9:
+Error (1834): Unimplemented feature error: Copying from storage to storage is not yet implemented. in FILENAME REMOVED
+ --> yul_unimplemented/input.sol:7:9:
   |
-6 |         delete a;
-  |         ^^^^^^^^
+7 |         a = b;
+  |         ^^^^^

test/cmdlineTests/yul_unimplemented/input.sol

@@ -2,7 +2,8 @@
 pragma solidity >=0.0;
 contract test {
     bytes a;
+    bytes b;
     function f() public {
-        delete a;
+        a = b;
     }
 }