Remove rustfmt component check

This was more valuable when we used the latest nightly without
specifying the toolchain version.

tests/fmt.rs

@@ -10,14 +10,6 @@ fn fmt() {
         return;
     }
 
-    // Skip this test if nightly rustfmt is unavailable
-    let rustup_output = Command::new("rustup").args(&["component", "list"]).output().unwrap();
-    assert!(rustup_output.status.success());
-    let component_output = String::from_utf8_lossy(&rustup_output.stdout);
-    if !component_output.contains("rustfmt") {
-        return;
-    }
-
     let root_dir = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
     let output = Command::new("cargo")
         .current_dir(root_dir)