Address review findings

(push missing `git add`)

runtime/near-test-contracts/src/lib.rs

@@ -13,23 +13,18 @@ pub fn trivial_contract() -> &'static [u8] {
 }
 
 /// Contract with exact size in bytes.
-pub fn sized_contract(size: usize) -> &'static [u8] {
-    static CONTRACT: OnceCell<Vec<u8>> = OnceCell::new();
-    CONTRACT
-        .get_or_init(|| {
-            let payload = "x".repeat(size);
-            let base_size =
-                wat::parse_str(format!("(module (data \"{payload}\") (func (export \"main\")))"))
-                    .unwrap()
-                    .len();
-            let adjusted_size = size as i64 - (base_size as i64 - size as i64);
-            let payload = "x".repeat(adjusted_size as usize);
-            let code = format!("(module (data \"{payload}\") (func (export \"main\")))");
-            let contract = wat::parse_str(code).unwrap();
-            assert_eq!(contract.len(), size);
-            contract
-        })
-        .as_slice()
+pub fn sized_contract(size: usize) -> Vec<u8> {
+    let payload = "x".repeat(size);
+    let base_size =
+        wat::parse_str(format!("(module (data \"{payload}\") (func (export \"main\")))"))
+            .unwrap()
+            .len();
+    let adjusted_size = size as i64 - (base_size as i64 - size as i64);
+    let payload = "x".repeat(adjusted_size as usize);
+    let code = format!("(module (data \"{payload}\") (func (export \"main\")))");
+    let contract = wat::parse_str(code).unwrap();
+    assert_eq!(contract.len(), size);
+    contract
 }
 
 /// Standard test contract which can call various host functions.