Avoid running the Profile step twice on x setup

Prevents runs like the following:
```
$ x setup
Welcome to the Rust project! What do you want to do with x.py?
a) library: Contribute to the standard library
b) compiler: Contribute to the compiler itself
c) codegen: Contribute to the compiler, and also modify LLVM or codegen
d) tools: Contribute to tools which depend on the compiler, but do not modify it directly (e.g. rustdoc, clippy, miri)
e) user: Install Rust from source
Please choose one (a/b/c/d/e): b

To get started, try one of the following commands:
- `x.py check`
- `x.py build`
- `x.py test`
For more suggestions, see https://rustc-dev-guide.rust-lang.org/building/suggested.html
`x.py` will now use the configuration at /home/nilsh/projects/rustfast/src/bootstrap/defaults/config.compiler.toml
Welcome to the Rust project! What do you want to do with x.py?
...
```

src/bootstrap/setup.rs

@@ -96,6 +96,10 @@ impl Step for Profile {
     }
 
     fn make_run(run: RunConfig<'_>) {
+        if run.builder.config.dry_run() {
+            return;
+        }
+
         // for Profile, `run.paths` will have 1 and only 1 element
         // this is because we only accept at most 1 path from user input.
         // If user calls `x.py setup` without arguments, the interactive TUI