Fix comment print in if (#15826)

tests/config/format-test.js

@@ -46,6 +46,7 @@ const unstableTests = new Map(
     "jsx/comments/in-attributes.js",
     ["js/ignore/semi/asi.js", (options) => options.semi === false],
     "typescript/union/consistent-with-flow/single-type.ts",
+    "js/if/non-block.js",
   ].map((fixture) => {
     const [file, isUnstable = () => true] = Array.isArray(fixture)
       ? fixture