sagemathgh-39607: add missing parenthesis in magma conversion file

    
as signaled by Max A.

### 📝 Checklist

- [x] The title is concise and informative.
- [x] The description explains in detail what this PR is about.
- [ ] I have linked a relevant issue or discussion.
- [ ] I have created tests covering the changes.
- [ ] I have updated the documentation and checked the documentation
preview.
    
URL: sagemath#39607
Reported by: Frédéric Chapoton
Reviewer(s): Dima Pasechnik

src/sage/ext_data/magma/sage/basic.m

@@ -153,7 +153,7 @@ intrinsic Sage(X::RngPad) -> MonStgElt, BoolElt
 {p-adic rings, either free precision model or exact model}
     prec := Precision(X);
     if Type(prec) eq Infty then
-      return Sprintf("Zp(%o, %o, 'relaxed')", Sage(Prime(X)), Sage(prec), false;
+      return Sprintf("Zp(%o, %o, 'relaxed')", Sage(Prime(X)), Sage(prec)), false;
     else
       return Sprintf("Zp(%o, %o, 'capped-abs')", Sage(Prime(X)), Sage(prec)), false;
     end if;