Workaround for nightly build (#1982)

# Description
Our backend fails to compile using the nightly compiler. For some reason
formatting the code generated for our contract bindings fails with
`rustfmt` on nightly.
Usually I would say that we should not change our code base to appease
the nightly compiler but in this case we only stop formatting auto
generate code that nobody (?) looks at anyway. And since this issue
seems to have blocked some people in the past I think it's an OK
trade-off.

# Changes
- [x] stop formatting auto generated contract bindings

## How to test
`cargo +nightly build` does not fail

crates/contracts/build.rs

@@ -558,11 +558,16 @@ fn generate_contract_with_config(
 
     println!("cargo:rerun-if-changed={}", path.display());
 
-    config(ContractBuilder::new().visibility_modifier("pub"))
-        .generate(&contract)
-        .unwrap()
-        .write_to_file(Path::new(&dest).join(format!("{name}.rs")))
-        .unwrap();
+    config(
+        ContractBuilder::new()
+            // for some reason formatting the generate code is broken on nightly
+            .rustfmt(false)
+            .visibility_modifier("pub"),
+    )
+    .generate(&contract)
+    .unwrap()
+    .write_to_file(Path::new(&dest).join(format!("{name}.rs")))
+    .unwrap();
 }
 
 fn addr(s: &str) -> Address {